Technical > Matt Shaff's Engine Shop

Compression for FED

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masracingtd1167:

--- Quote from: hemidakota on April 02, 2021, 09:38:16 PM ---
--- Quote from: masracingtd1167 on March 28, 2021, 10:21:36 AM ---If you have a small cc head you should still be able to get at least 11 to 1 out of it ! When I started messing around with 20 percent nitro I went to a flat top piston to drop compression down ! To my surprise it really didn't slow down much on straight alcohol ! The best it ever ran on the higher compression straight alky was 7.24 and with the lower compression straight alky 7.32 ! If you need to make a little more power just put a little nitro 10 to 15 percent and that will wake it up !

--- End quote ---
How much of a compression change and from how high of compression? Just interested, thanks

--- End quote ---
      With the high compression it was 13.8 now down to 12 to 1 !

wideopen231:
Good news is lower compression motor have huge tuning window and normally respond well the MFI, Unless you are looking to get every thing you can out of motor I would sweat a point or so on compression. Plus just allow you to run higher percentage of nitro w/o worry of detonation.

Curly1:
I have ran alcohol on low compression 9.4 to 1 motor and it really picked it up. Just run it on alcohol as is and if you want to add some Nitro you can. From my experience you can not run much Nitro with high compression.

As for raising compression, thinner head gaskets, smaller chamber heads or bigger dome pistons.

nitroscott:
Alot of good information. Thanks for replying.

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