Stock cam choices?

[Crazyswede]

The lowered compression only happens when you put the 2.1 head over 2.0 pistons.

Gary Reider stuck a turbo and T5 on a 2.1 motor (bottom end. and top end). It has really good pickup off boost.

T5 is sophisticated enough to handle the boost on a higher compression engine.

I put a 2.1/2.3 head on a 2.0 litre turbo block and the compression dropped.

[Cark]

I have heard the 2.1 turbo setup is very fun, but you're essentially limited to an LPT setup with such a high C/R

And yeah, my B202 has 2.0 liter pistons in it of course... so the C/R would drop with the 2.1 head

[Crazyswede]

I have heard the 2.1 turbo setup is very fun, but you're essentially limited to an LPT setup with such a high C/R

And yeah, my B202 has 2.0 liter pistons in it of course... so the C/R would drop with the 2.1 head

The motor Gary was running was a 2.1 liter non turbo engine with a turbo and T5 bolted on.

[Cark]

^right. I know of a few other people who have put a turbo on the 2.1 n/a motor. But like I said above, it's a high compression motor and you can't run much boost. Hell iirc even Jeff Prop was running super low compression in his blue Airflow car, something like 7.5 or 8.0:1? But that enabled him to up the boost big time. Actually here, found it, "he has a stock block bored .0020 over and is running B-Series pistons out of a 99 Turbo. This drops his comp ratio to 7.25 to 1 This lets Jeff run gobs of boost without worrying about detonating."


I'd be happy the find a compromise between off boost performance and a nice punch of 18-20PSI when I need it.

[Jordan]

I have heard the 2.1 turbo setup is very fun, but you're essentially limited to an LPT setup with such a high C/R

And yeah, my B202 has 2.0 liter pistons in it of course... so the C/R would drop with the 2.1 head

Gary was/is running quite a bit of boost (14-18psi) with the high compression pistons without issue. Long term...not sure, Race gas on occasion....probably, but I think you could run stock turbo boost 11-12psi with high compression running 93 on T5 without much issue.

[99Super]

I'd be happy the find a compromise between off boost performance and a nice punch of 18-20PSI when I need it.

I run 91mm 8.5 B201 pistons w/ a 2.3 head. Decent off-boost, holds 19lbs of boost on T5 just fine.

John

[gmreider]

I have heard the 2.1 turbo setup is very fun, but you're essentially limited to an LPT setup with such a high C/R


Gary was/is running quite a bit of boost (14-18psi) with the high compression pistons without issue. Long term...not sure, Race gas on occasion....probably, but I think you could run stock turbo boost 11-12psi with high compression running 93 on T5 without much issue.

Gary chiming in here. My 2.1 Na motor, now with a small Mitsubishi turbo off a 91-93 900C car with the small intercooler and the addition of an oil cooler with T-5 has survived about 90 miles of laps on a road course at Summit point and 12 Hill climbs in the last 2 years. Plus 1- 800 mile trip to New England. I started out running 7-8 pounds boost and now run 13-14 pounds like a daily driver and run up to 20PSI hill climbing. I have not broken anything yet. I can get 28-29 MPH on a road trip and the car is fun to drive. Not the snap of a big turbo , but quick spool and real good torque range. Don't be afraid to build something like this car. I would be cautious about running the car with LH injection , But T-5 technology offers all sorts of safe guards for the motor that makes the thing hold together.

[Cark]

Thanks for the post Gary! This is very interesting stuff and something for me to think about down the road.

Right now I'm just looking forward to getting a working motor in and enjoying the rest of the summer behind the wheel of my c900.

[Crazyswede]

I have heard the 2.1 turbo setup is very fun, but you're essentially limited to an LPT setup with such a high C/R


Gary was/is running quite a bit of boost (14-18psi) with the high compression pistons without issue. Long term...not sure, Race gas on occasion....probably, but I think you could run stock turbo boost 11-12psi with high compression running 93 on T5 without much issue.

Gary chiming in here. My 2.1 Na motor, now with a small Mitsubishi turbo off a 91-93 900C car with the small intercooler and the addition of an oil cooler with T-5 has survived about 90 miles of laps on a road course at Summit point and 12 Hill climbs in the last 2 years. Plus 1- 800 mile trip to New England. I started out running 7-8 pounds boost and now run 13-14 pounds like a daily driver and run up to 20PSI hill climbing. I have not broken anything yet. I can get 28-29 MPH on a road trip and the car is fun to drive. Not the snap of a big turbo , but quick spool and real good torque range. Don't be afraid to build something like this car. I would be cautious about running the car with LH injection , But T-5 technology offers all sorts of safe guards for the motor that makes the thing hold together.

Snakes put a turbo on a N/A 2.1 motor and ran LH. As I recall it was running a lot of boost and still lasted long enough to have some fun with but I think it did finally punch a hole through a piston. I think he was using it for Rally X and ice racing.

[Crazyswede]

Another interesting note...Luke's old rally engine with the T5 head and hybrid turbo was a good example of what these engines can do. We inadvertently ran it for a couple of stages at full power without an intercooler and without water injection. The engine was putting out around 300 hp at that time and showed no sign of issues. The new heads with better flow and much better combustion chamber designs really aid in performance and allow for high compression ratios in turbo charged engines. Another example is the Suzuki Hayabusa engine. In stock form the engine makes around 190 hp from 1300 cc's at a compression ratio of 12.5:1. The same engine can be turbo charged without changing the internals and only remapping the computer and possibly changing the injectors. Outputs easily jump into the 300hp range and thats still running high octane pump gas.

[Cark]

^this rally engine you speak of was a 202 block/pistsons?

[Crazyswede]

^this rally engine you speak of was a 202 block/pistsons?

It was a turbo block and pistons with a t5 head, hybrid turbo and aftermarket efi system.

[Cark]

^And to get back to the original topic of the thread... what cams?

I could see the logic in the better flowing T5 head, but again, you're talking race application and high end power, when I want low-mid around town and back road drivability.