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Discussion Starter · #1 ·
can anyone post there f8 twin piped dyno sheet.i would like to see how theirs looked.dynoed mine at carl gallaways last week and it didnt seem to peak at all.what i mean is we got the motor up to operating temp (about 145 deg.)then made a pull with it hot and it 169 hp at7700 and stayed at 169 hp to 8200 rpm then drop off. it also made peak torque at 7700.most sled i have dynoed if it made peak torque at 7700 would normally make peak hp at a higher rpm not stay the same for 500 rpms.
 

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Originally posted by jpc@Oct 9 2005, 02:57 PM
can anyone post there f8 twin piped dyno sheet.i would like to see how theirs looked.dynoed mine at carl gallaways last week and it didnt seem to peak at all.what i mean is we got the motor up to operating temp (about 145 deg.)then made a pull with it hot and it 169 hp at7700 and stayed at 169 hp to 8200 rpm then drop off. it also made peak torque at 7700.most sled i have dynoed if it made peak torque at 7700 would normally make peak hp at a higher rpm not stay the same for 500 rpms.
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If you are able to have a 500 rpm window for power with a twin setup I think your doing pretty good . It's probably going to go right to 7700 when you whack it out in the field because of the peak torque . Then as the pipe heats up it will make it's way to the 8's . My D&D f8 had 112 lbs from 7700 to 7900 and then peak hp at 8300........... 176 hp . I was able to generate alot of pipe heat in the dyno room for a 8300 peak but it was fastest in the field at 8 to 8100 ....................leaving from a dead start at about 7800 . I think if your pushing 170 at 145 deg. water temp you have a pretty good motor . :div20:
 

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Discussion Starter · #5 ·
112.1 at 7950.and was at 168 with 107.6 at 8200. thats what i was talking about.it was 169 hp for 400 rpms.my 1107 i hade made peak torque at 8800 and was at 208hp but made 220 hp at 9200 rpm.this sled the hp doesnt climb any after the peak torque.the hp stays the same. :dunno:
 

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Originally posted by jpc@Oct 9 2005, 07:58 PM
112.1 at 7950.and was at 168 with 107.6 at 8200. thats what i was talking about.it was 169 hp for 400 rpms.my 1107 i hade made peak torque at 8800 and was at 208hp but made 220 hp at 9200 rpm.this sled the hp doesnt climb any after the peak torque.the hp stays the same. :dunno:
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There are a few factors that may limit your peak hp or overev power . Timing, compression , pipes , etc . I don't know if your running a stock overbore or aftermarket cylinders . Whoever built the motor could probably explain why it is what it is better and possibly make the nessacary adjustments to give you more of what you want .
 

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Discussion Starter · #8 ·
stock cylinders,slp pipes,and i built it.but i did things different then most stock f8s.most builders deck the bottom of the cylinders as much as they can and have about 204 degrees exaust duration.a stock f7 has 200 degrees.so i also decked my cases so i now have 200 degrees exaust duration like the f7s.my thought was they run hard as a f7 so why not build a f8 with the same port timing.have raced alot of f8s and havent hade any one close to me yet but,thats in the snow.havent figgerd it out on the grass yet.or maybe it just wont work!
 
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