Now I have done my searching and I have done reading on this topic of using a 95mm (b21) Crank in a gsr with custom rods. I want to get an updated opinion on it about what everyone thinks.

Since Crower generally uses all stock (remanufactured) cranks for there stroker kits, I would lead my self to believe that since they actually offer a 95mm crank that it was originally out of the b21 prelude.

I have done the reasearch on a b21 crank compared to a Stock GSR crank and all the tolerances and measurements are the same except for the Crankshaft Runout where it is .030mm on the GSR and .010mm on the 95mm crank. What needs to be done to make this match the GSR.

If this is true or not, the 95mm crank out of the prelude should be strong enough to handle some power. Now with a strong enough rod combination, would you think this crank might work to turn a 84mm GSR block to roughly a 2.2L?

All Comments and Concerns very welcome

 

I'm sorry I meant to say an 84mm 2.1L GSR

 

i think you mean b20, not b21

 

Have you had a chance you get your hands on a b20a crank yet? When I compared the to cranks(B20a and Gsr crank) I found that the part of the crank were the oil pump gear normally fits on is alot more shorter then the gsr crank. And when I placed the B20a crank in to the Ls/gsr block then placed the oil pump on I found that the gear doesent even fit over the crank. So that would mean that the motor would never see any oil pressure at all.

When I did this like 2 years ago I used a Ls block, with the B20A crank, and b16 rods, with Je pistons. But never got the setup to work because of the oil pump problem. Maybe if you used a dry sump or something it could work. just my .02 cents

 

This is way worth it but takes some custom parts. you need to call Vernon at Raver motorsports he did mine and my brothers and they are bad ***. MAD torque! He has the cranks already and has the custom cnc oil pump drive already done. You also have to lengthen the nose of the crank approx. 3/8 of an inch and cut a whole on the flywheel side to accomidate for the pilot bearing from the B-series flywheel. My little brothers car has 38,000 miles on it and has never had a problem. When Brian Crower sold these cranks he was having trouble breaking them and having a lot of vibration under normal RPM, but my brothers has no vibration and it sees 8,000 all the time! You also need to get regular LS rods and he already has custom pistons with the correct pin height. I believe they are 12.5 to 1 compression. His number is 559-733-4711.

 

This will be for a fully-built street car so I am looking for the reliability. Has Vernon used many of these cranks on High boost cars. I already have my 84mm CP pistons and I am going to be running approx. 9.3:1 compression at a relatively low boost for the streets, but would Like to get the displacement for the t3/t67 ball bearing turbo that I am going to be attempting to run on the street. I wouldn't mind getting a Dry sump Oil system since I have done alot of looking into it but haven't quite decided.

Also I have to decide if the .1l displacement is really worth all of the extra ching since I have 2 b20z cranks already. What Does vernon charge for this crank if you know off the top of your head, I am very interested.

Thanks guys

 

anybody else have opinions on the subject

 

In my opinion its not worth it, especially if your going to boost it. Im running an 84mm GSR motor with an 89mm LS crank giving me 1.97L. To get that extra 100cc your going to have to do ALOT of extra work.

But then again, big block Hondas are cool.

 

You have to have custom pistons so I would say build your 2.0 liter and call it a day. But if you want to know some more details call him. He is very nice and very knowledgable. As for pushing the cranks with high boost, I know he hasn't done any with boost just all motor. My personal race car is boost and n2o but it's not running yet. For a street car i would never put a dry sump in my car. They are ment for race cars that don't see day to day traffic. I would stay clear of the dry sump idea and it is pretty pricey!