Gran Turismo Performance

Gran Turismo Performance Home of the GT186 small block and GT200 large block kit as well as many other Lambretta performance

Quantum shifts in Syria over the last 48 hours. Watching the BBC report and noticed the Rebels are riding to Damascus 2 ...
08/12/2024

Quantum shifts in Syria over the last 48 hours. Watching the BBC report and noticed the Rebels are riding to Damascus 2 up on a series 2 Lambretta! Fire up the transit Carlos Newberry, you missed one

Just a bit more tooling for anyone that fancies modifying GP crankshafts. This tool was used to modify webs and precise...
12/10/2024

Just a bit more tooling for anyone that fancies modifying GP crankshafts. This tool was used to modify webs and precisely machine pockets for stuffers (original prototype cranks shown in picture). Can be used on either CNC machines or a manual miller with a DRO depending on what you want to do. £40

Just clearing out some old tooling that might be beneficial to someone. I have different tooling for castings these day...
12/10/2024

Just clearing out some old tooling that might be beneficial to someone. I have different tooling for castings these days, this tool is designed for original heads . Here we have a cylinder head holding tool for skimming and re-profiling big block and small block cylinder heads in a lathe. Importantly, this fixture doesn't require the cylinder stud holes to be tapped out to M10, you simply offer the head up lock it in place with the taps and away you go. It also has a milling attachment so heads can be held accurately for milling spark plug holes etc. Everything you see in the pictures £60 message me if you're interested

Here's the latest on the GT400LC project. 2 months ago the engine kits were finished and shipped to their prospective o...
19/07/2024

Here's the latest on the GT400LC project. 2 months ago the engine kits were finished and shipped to their prospective owners (one in UK and one in Australia). These engines use the SeaDoo 787 power valve cylinder manufactured by Rotax. The cylinder is bored to 82, and uses our monster 76mm stroke crank. This is coupled with a 133mm con rod, 26mm crank pin and 20mm gudeon pin, All big stuff and all extremely durable. The build was entrusted to highly experienced Rotax officinardo and sprint hooligan, Steve Holt who has executed a great build. We had some glitches along the way, I'd forgotten to check spark plug to frame clearance with this bigger cylinder however Charlie Edmonds saved the day with quite possibly the shortest spark plugs I've ever seen and the assembly fitted perfectly. This is the first dyno pull and returns a peak of 43bhp and 34ft/lbs torque. However, look at how wide the power delivery is and when it comes in, it's an absolute stump puller! There is definitely loads more left to develop with this configuration but the first objective was to get it on the road and riding over the summer. There are more detailed pictures of the engine in earlier posts below. We still have lots more in the development funnel so keep an eye on what we're up to and look through the shop if you need Lambretta performance parts anything from shaft drive to series 3. Standard engines to 300cc liquid cooled monsters.

Finally finished the GT400LC engines. It will be really interesting to see how they perform. Finally getting some of the...
18/05/2024

Finally finished the GT400LC engines. It will be really interesting to see how they perform. Finally getting some of these builds completed and clearing the decks for the next.

More progress on the GT400LC power valve engines, all the bottom ends are together. Waiting for a few fasteners and O ri...
05/05/2024

More progress on the GT400LC power valve engines, all the bottom ends are together. Waiting for a few fasteners and O rings to arrive. Need to clean up the power valves then the final assembly push is on. As these two engines are the only ones of their type I decided to assemble them to check everything fits together before they find new owners. Both of these engines run a Rotax 787 cylinder previously used in a jet boat. The cylinder is bored to 82mm and runs a 76mm stroke crank. The ignition is RS125 so there’s heaps of electrical power for pumps, lights and all other manor of goodies. I can’t wait to see what the new owners do with then.

One Gran Turismo project that I’ve had on the back burner for a while are these 2 Rotax 787 cylinders that fit to our hi...
20/04/2024

One Gran Turismo project that I’ve had on the back burner for a while are these 2 Rotax 787 cylinders that fit to our highly adaptable engine cases. These two engines are absolute weapons, 82mm bore 76mm stroke with power valve. Originally they were developed and used in SeaDoo jet boats but now have an alternative future on 10” wheels. Many parts are specially made but all fit in the the Gran Turismo Rotax cylinder program of water cool jet ski and snowmobile cylinders. If you’re looking for your next exotic engine or a stonking torque behemoth get in touch

Now available in the Gran Turismo web shop and all good scooter dealers is the new Gran Turismo GT200-SB long stroked bo...
22/01/2024

Now available in the Gran Turismo web shop and all good scooter dealers is the new Gran Turismo GT200-SB long stroked bolt on cylinder kit for SMALL BLOCK engine cases.
Designed around the GT62/110 and GT64/110 crank shafts, this new kit delivers increased performance, long distance touring and capacity. The 62 stoke crank returns a stock capacity of 200cc and the 64 stroke 206cc based of the proven Yamaha RD350LC used in the GT186 kit for the past 25 years (yes, it really has been that long!). The cylinder also has 9 piston over-sizes maxing out a 66.5mm (although not recommended to make that jump, that would be 221cc on a small casing!).
https://gran-turismo.myshopify.com/products/gt200sb-kit-25mm-manifold-and-head
https://gran-turismo.myshopify.com/products/gt200sb-kit-30mm-manifold-and-head

Just arrived in stock, our new delivery of small block cylinders in time for new year engine builds. Plenty more happen...
10/01/2024

Just arrived in stock, our new delivery of small block cylinders in time for new year engine builds. Plenty more happening in the early part of 2024 from Gran Turismo. With Scooter Meltdown looming there's lots of work to pack deliveries for our customers...

Here they are, after a long wait getting the new production tooling just right for the new Gran Turismo small block kit....
17/12/2023

Here they are, after a long wait getting the new production tooling just right for the new Gran Turismo small block kit. Lots has been done, new tooling, tweaked features, changed machine shop, changed machining method. Outwardly everything looks the same but there are a couple of small changes. The exhaust port has a slightly modified shape, closer to the big block cylinder. The boost port is a little wider, the fins a little thicker and some very minor adjustments to the transfer ports. While I was at it I reduced the number of fins, re-spaced them and increased the cylinder length.
So why do this? Well, the original tool was single impression and this reduces the production efficiency. The castings were costing substantially more than the big block casting and this had to be addressed or manufacture wouldn’t be viable. By implementing these new adjustments it also permits a new kit to be produced the GT200SB (SB for small block).
The original GT186 was designed for easy cost effective builds with 58 stroke 107 cranks, this kit configuration is still supplied. The same casting also works very well with 60 stroke 110 cranks upping the capacity to 193cc. The new kit is the same casting but machined work with 62 and 64 stroke cranks with the same 64mm RD350 piston and room for 9 over-sizes. This new long stroke kit has a capacity from 200cc to 220cc and is designed to use the Gran Turismo 62mm and 64mm (with copper head gasket) 110 cranks. Any questions please ask. For those interested in machining, I now machine all the GT cylinder kits on a twin spindle Mazak Integrex. The only tooling required is a new set of soft jaws for each kit variant, no tooling changes, not fixture change overs, no cycle breaks. Put in a raw casting….take out a finished machined part.
Both kits are the same price and will be available through the web shop.
GT186cc kit, 30mm manifold and head – Gran Turismo (gran-turismo.myshopify.com)

Christmas time is coming and things are getting busy again in the GT stables. New in this week is the latest batch of G...
03/12/2023

Christmas time is coming and things are getting busy again in the GT stables. New in this week is the latest batch of GT engines cases, supplied with our gear box end plate and our unique SS seal and bearing retaining plates. The delivery of 80 engine cases arrived after a 12 month wait and gave me the logistical problems between machine shops (turns out it requires 3 fully loaded trips in the VW). Any how, they're all back, packed and ready for shipment.
https://gran-turismo.myshopify.com/products/gt-engine-case-standard-200-inc-end-plate-v4

Things are starting to get moving on the Gran Turismo Twin. Both the cranks and all the CNC parts have been machined, b...
01/10/2023

Things are starting to get moving on the Gran Turismo Twin. Both the cranks and all the CNC parts have been machined, bearing and seal kits are in, even the long awaited crankcases have turned up and made their way over to the CNC. Just a few more components to go like the inlet manifold, pickup bracket and fastener list. Those final parts should all synchronise with the finish machined crank cases then assembly begins, exciting times! From the pictures you can see how the casing and mag assembly goes together. The engine is designed for practical assembly and realistic production cost. Consequently the design uses the same drive train as the GT300LC engines which is a huge advantage to common part strategy.
Two engines are being built with 290cc power valve top ends and I'm starting work on a third top end that'll use a Rotax Max Junior cylinder (260cc). The kart variants are 5mm shorted, different stud spacing and non power valve. This is a top end mounting plate swap out so its easy to test both configurations on the same bottom end without completely stripping the motor.
I'll post more as we get along.

A bit more action on the Twin cylinder project. This time we have the crankcase extension, the cylinder base plate, wat...
01/09/2023

A bit more action on the Twin cylinder project. This time we have the crankcase extension, the cylinder base plate, water cooling manifold and mag side crankshaft ready for dry building. Miraculously, after a very very very long wait the aluminium foundry have got their MoJo back and are producing crank cases. I should have a delivery of 60 next week. There is a big back order of cases so it is a priority that the standard cases are machined first before the twin so more waiting I'm afraid but enough to show at the moment and I think you can see how the design is going together, simple on the surface but to get the design as tightly packaged and as narrow as it it the design has to be quite sophisticated. There're a few things to check this weekend, build up the drive side cranks and get the wire eroder running to make the crank joiners. Availability, fully specifications and prices to follow once the two prototypes are running. It's all very exciting...Adam Winston, you can't un-see this your wallet has just reached event horizon!

Today has been crank building day but with a difference. No standard cranks here, instead we have a monster 64 stroke b...
28/08/2023

Today has been crank building day but with a difference. No standard cranks here, instead we have a monster 64 stroke big web crank with YZ250 125mm rod, 113mm diameter, 60mm wide with a GP taper to suit the EGIG 405cc engine.
Followed by the biggest crank and cylinder we can currently fit in our engine case, the monster 75mm stroke 133mm long rod designed for the Rotax 787 cylinder bored to 82mm. That's a liquid cooled 400cc, power valve. There will be two of those engines built this year and no more.
Finally, the twin cylinder starts to take shape, these are the mag side cranks which use RD400 rods and pins. The machine shop have had a full 3 weeks on the rest of the twin parts so I will be able to post progress and pictures on that project soon.

DSC Lambretta and Mick Abbey have produced a little cracker of a GT110 kit and custom expansion pipe, check it out
27/08/2023

DSC Lambretta and Mick Abbey have produced a little cracker of a GT110 kit and custom expansion pipe, check it out

I can't wait to see what they do with this one!
06/07/2023

I can't wait to see what they do with this one!

Work is progressing on the GT290cc Twin engine. Today the crank webs arrived and fit together perfectly with a nice snap...
13/06/2023

Work is progressing on the GT290cc Twin engine. Today the crank webs arrived and fit together perfectly with a nice snap fit. The cranks use two RD400 con rods and are joined with a custom made edm and ground collar. The drive web has a captive M8 x 1 pitch bolt that secures both webs together in a number of different firing orientations 180 or 90 deg. The build manual is also in process and once the first 2 engines are built I’ll release it an publisher the build costs. Producing these type of high power LC engines is extremely complex so production will likely be done in batches of 10 or so. A big THANK YOU to everyone who has registered their interest and encouragement. If you’re interested in this engine get in touch

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More progress on the GT400LC power valve engines, all the bottom ends are together. Waiting for a few fasteners and O rings to arrive. Need to clean up the power valves then the final assembly push is on. As these two engines are the only ones of their type I decided to assemble them to check everything fits together before they find new owners. Both of these engines run a Rotax 787 cylinder previously used in a jet boat. The cylinder is bored to 82mm and runs a 76mm stroke crank. The ignition is RS125 so there’s heaps of electrical power for pumps, lights and all other manor of goodies. I can’t wait to see what the new owners do with then.

More progress on the GT400LC power valve engines, all the bottom ends are together. Waiting for a few fasteners and O rings to arrive. Need to clean up the power valves then the final assembly push is on. As these two engines are the only ones of their type I decided to assemble them to check everything fits together before they find new owners. Both of these engines run a Rotax 787 cylinder previously used in a jet boat. The cylinder is bored to 82mm and runs a 76mm stroke crank. The ignition is RS125 so there’s heaps of electrical power for pumps, lights and all other manor of goodies. I can’t wait to see what the new owners do with then.

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