as i have been trying to decide my build yada yada i was wondering which would be better- a higher compression, shorter stroke, lower boost car, or vice versa lower compression, longer stroke, higher boost?

im basically deciding whether to do a forged long rod 4.3 with like a 8.7:1( i think this is the lowest) compression and mucho boost or keep a more stock-ish type of setup and say 10:1 or 11:1 compression and like 8-9 psi (i havent looked for forged rods other than the 4.3 but im sure they are avail) keep in mind i am building the tranny, rear, and car for a eighth mile track/street car so it needs to wind up faster

input now!


(edit) and if i didnt say it this is a m112 car

 

For F/I you want low compression. I'm gonna try to have the compression in the mid 8's on my build, and then up the boost.

If you want gobs of power with a twin screw, then wait until the economy picks back up and I start working more so I can figure out how to make a whipple fit under a stock hood.

 

Do you work with cars for a livng ryan?

 

Get the longrod 4.3 package with 8.7 CR, it will work quite nicely with the M112. The low compression make it easier/safer to use pump gas.
Ryan by that time i will be done with my engine and be ready for a twin screw as well lol.

 

Not anymore, only did it professionally for a year, and that was on diesel dragsters. I've just been doing it a long time. I work offshore as a safety consultant, and 2 days ago I was offered a position in engineering, so I may take that.

 

Oh yeah I forgot you worked offshore.

 

Would it not be more efficient to run a higher compression at moderate boost even assuming that a water meth system is used? Isn't a reason that a lower compression is used is due to the heat? And for now I'm not too worried about a twin screw ill stick with the eaton