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914World.com _ 914World Garage _ Anyone running the 90mm 10.3:1 Pistons

Posted by: wallys914 Dec 4 2008, 11:37 PM

Just wondering, looking at them wondering if they are reasonable streetable, and if any one who has them noticed an HP difference.....

Thanks

Posted by: J P Stein Dec 5 2008, 07:08 AM

I'm running 10.5 :1 Mahles. Single plug & race gas. With a twin plug set-up you could get by with street gas....I think. I used to run 9.7 :1 with street gas ...on the street even. That's pushing the limit for single plug.

Yes, there is a decent hp/torque bump over the 8.5 :1 RS PCs.
The RS made 210 hp, 188 ftlbs with S cams at the crank. I'm making 198 hp & 190 ftlbs at the wheels with Solex cams, both at lower rpms that the RS (WAG 225 & 215 at the crank).