408ci F-1R Compression
#2
More info on current setup....
Bore 4.030
Stroke 4.00
Head Gasket thickness .035 . This is open ended...
Deck Height .004-.009 Really not sure on this I have to check with my builder
Piston top volume 25cc
Combustion Chamber 72CC
Curent range of compression now. 8.87:1 to 8.95:1 again this depends on head gasket and what my deck height is.
Bore 4.030
Stroke 4.00
Head Gasket thickness .035 . This is open ended...
Deck Height .004-.009 Really not sure on this I have to check with my builder
Piston top volume 25cc
Combustion Chamber 72CC
Curent range of compression now. 8.87:1 to 8.95:1 again this depends on head gasket and what my deck height is.
#4
I had a similar choice recently when I specced my AFR heads - range was 8.9:1 to about 9.3:1, on 434ci. I decided to go with the largest chambers and the correct gasket thickness to hit a quench target of ~.040". I figure anything over 400ci is not going to suffer on the low end, and the lower CR will be more boost friendly.
Decided yesterday to run E85 instead of pump and meth, since I just found out they opened a couple stations near me.
Jim
Decided yesterday to run E85 instead of pump and meth, since I just found out they opened a couple stations near me.
Jim
#5
More info on current setup....
Bore 4.030
Stroke 4.00
Head Gasket thickness .035 . This is open ended...
Deck Height .004-.009 Really not sure on this I have to check with my builder
Piston top volume 25cc
Combustion Chamber 72CC
Curent range of compression now. 8.87:1 to 8.95:1 again this depends on head gasket and what my deck height is.
Bore 4.030
Stroke 4.00
Head Gasket thickness .035 . This is open ended...
Deck Height .004-.009 Really not sure on this I have to check with my builder
Piston top volume 25cc
Combustion Chamber 72CC
Curent range of compression now. 8.87:1 to 8.95:1 again this depends on head gasket and what my deck height is.
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#11
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Location: Texas / 427ci F1R 1,002 rwhp/928 rwtq
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It is going to depend on what the goals are for the engine. Boost makes more top end power than compression. Compression will give you a faster response time. If you are planning to make a lot of power, I would not recommend e85 because of its inconsistancy. I am making over 1,000rwhp on 93, spraying 100% M3. If you have easy access to e98, I would surely go that route, so you can run more timing. 9-9.5:1 seems to work well with an upper midrange of boost 16-22#. Less than 9:1 works if you are drag racing and launching hard under boost. 10:1 works with lower boost (10-16#). High compression 10-11:1 with low boost 8-12#. There is no need for an F1R if you do not plan on boosting the hell out of the engine, so plan according to your goals.