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are the cranks in the psi twin motors that use polaris cases weak? i know that the polaris cranks are weak
psi motor?
- Thread starter crzymtnex
- Start date
Most of the big twin PSI used cranks made by Rad.
Rad is no longer in buisness, so its hard to get parts for the cranks.
To answer your question though, the Rad cranks were very tough.
Rad is no longer in buisness, so its hard to get parts for the cranks.
To answer your question though, the Rad cranks were very tough.
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PSI who?....OH are they still around?! 
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can people still get parts for them?
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good luck
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i was looking at getting a 1085 am i not going to be able to find any support for this motor for parts or should i find something else
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Yea i would...especially with the economy the way it's been going and the bad rep that PSI has gathered, i'd look into a different performance motor....maybe like a Cutlers or a Struthers 910 or somethin
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PSI = Pretty S h it ty Investment
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you would be way better off buying a carls 910. there is one on here for a good price in the engine swap meet section.
PSI motors do work but we have looked into reboring cylinders to sizes that we can get pistons for. Don't ask me what fits what but apparently the 1080 PSI can be bored out to 1150 and use cutler pistons.
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My rad crank in my 990 broke 3 times
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I think the polaris cased engines were prone to more flex than say the 995 with the different case. Maybe that was part of the crank issue? Were you running an engine plate/stiffener with the 990?
Parts are sure to become scarce. I have a 995 and figure it has a pretty short lifespan. I will be looking for something turbo'd to replace it.
Parts are sure to become scarce. I have a 995 and figure it has a pretty short lifespan. I will be looking for something turbo'd to replace it.
My bad it was a 995 wwith the psi cast case. i beleive some of the issues were poor machine tolerances on the case, and yes i had a stiffner on it. Psi re machined the case 3 time trying to get it right. I finally gave up and moved on.
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I was thinking you had a 925?
That's the story with mine. It was born a 1085. The guy punched it out to 1155 and sold it to me.
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how does that 1150 work for you?
