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I came across the Suzuki Raider online a few weeks back and found the engine looking very similar to the RTR series(The platform is Suzuki's gift to TVS).The raider is a four stroke four valve 150cc 16 HP underbone sold in South east asia and is the fastest in its class.So After some researching,I found out that the Block-piston and engine head of the Raider can be transplanted on the RTR with some modification.
The first picture is the engine cut-view simulation model of the Raider engine.The second is the block and head intersection plane showing the oil return passage.It is beside the front left holding stud of the engine while for the RTR it is between both front studs.The only modification of the crankcase is the drilling of a hole to allow the oil from the head to flow into the crankcase.
We will also need the timing chain from the raider as the DOHC head has a longer chain.(The height of the engine block is eerily similar).The Raider has a stroke length of 48.8mm giving it a compression ratio of 10.2:1 with the stock head.The RTR 160 with this block-piston will displace about 157cc and will have a compression ratio of about11.2:1 while for the 180 it stands at 12.01:1(According to my calculations) and the engine will displace 175cc(It has a bore of 62mm). I have started saving for the modification and Will need inputs from all of you.If anybody else is also thinking of giving this project a try please let me know We can share our knowledge and do a full possibility study before thinking of ordering any parts for it.Anyways,I have made a tentative list of required components for the transplant.
1)Block-piston assy.(Raider 150)
2)Complete head assy.(Raider 150)
3)Timing chain(Raider 150)
4)Cam set both intake and exhaust(Raider 150)
5)Head and Cylinder gasket(Raider 150)
The whole operation may set one back by upto 30K due to the fact that the components are not available here in India.Hence,I need to concretely be sure before I do anything stupid.I request the people who have worked on souping up engines to also help me out with the permissible value for compression ratio and valve clearances that the RTR's longer stroke will need.Also some other changes to the exhaust header and crankcase breather reed valve(It sits in a triangular plate bolted to the engine head cover on one side and frame backbone going from the steering head to seat sub frame on the other two sides)are required for it.The oil pipeline to the engine head also needs to be modified.
Forgive me for not composing the post by arranging pictures near related text but it is my inability to fully utilise the new (I haven't been active lately)website features as I am still learning .
The first picture is the engine cut-view simulation model of the Raider engine.The second is the block and head intersection plane showing the oil return passage.It is beside the front left holding stud of the engine while for the RTR it is between both front studs.The only modification of the crankcase is the drilling of a hole to allow the oil from the head to flow into the crankcase.
We will also need the timing chain from the raider as the DOHC head has a longer chain.(The height of the engine block is eerily similar).The Raider has a stroke length of 48.8mm giving it a compression ratio of 10.2:1 with the stock head.The RTR 160 with this block-piston will displace about 157cc and will have a compression ratio of about11.2:1 while for the 180 it stands at 12.01:1(According to my calculations) and the engine will displace 175cc(It has a bore of 62mm). I have started saving for the modification and Will need inputs from all of you.If anybody else is also thinking of giving this project a try please let me know We can share our knowledge and do a full possibility study before thinking of ordering any parts for it.Anyways,I have made a tentative list of required components for the transplant.
1)Block-piston assy.(Raider 150)
2)Complete head assy.(Raider 150)
3)Timing chain(Raider 150)
4)Cam set both intake and exhaust(Raider 150)
5)Head and Cylinder gasket(Raider 150)
The whole operation may set one back by upto 30K due to the fact that the components are not available here in India.Hence,I need to concretely be sure before I do anything stupid.I request the people who have worked on souping up engines to also help me out with the permissible value for compression ratio and valve clearances that the RTR's longer stroke will need.Also some other changes to the exhaust header and crankcase breather reed valve(It sits in a triangular plate bolted to the engine head cover on one side and frame backbone going from the steering head to seat sub frame on the other two sides)are required for it.The oil pipeline to the engine head also needs to be modified.
Forgive me for not composing the post by arranging pictures near related text but it is my inability to fully utilise the new (I haven't been active lately)website features as I am still learning .
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