418 build
New User
Joined: Aug 2007
Posts: 8
Likes: 0
From: Glendora, CA
Are you building a drag racer that will be at WOT all the time, every time? OR, like you mentioned, a daily driver?
Because, if you build the former but try to use it as a daily driver it won't ever idle smooth or run well, except at WOT. Too big of a carb is a classic error.
Just by way of illustration as an experiment, plug in your RPM at a regular highway cruise speed of say, 65 mph into the CFM tables. Hint: It won't be 750 CFM, not even close.
Just something to think about. Now I'm not against big carbs, it's just that for the best performance it's actually better to error on the side of too small, not too big. Especially on a daily driver.
Because, if you build the former but try to use it as a daily driver it won't ever idle smooth or run well, except at WOT. Too big of a carb is a classic error.
Just by way of illustration as an experiment, plug in your RPM at a regular highway cruise speed of say, 65 mph into the CFM tables. Hint: It won't be 750 CFM, not even close.
Just something to think about. Now I'm not against big carbs, it's just that for the best performance it's actually better to error on the side of too small, not too big. Especially on a daily driver.
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Tuned
Joined: May 2010
Posts: 281
Likes: 9
From: Benton City, Wa
Seriously though, that looks like a darn good compromise for what I'll be running. Huge thank you for the advice & link.
Every ones input has already saved me from some MAJOR possible mistakes for the build. This group is A #1..
Dan
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Tuned
Joined: May 2010
Posts: 281
Likes: 9
From: Benton City, Wa
418 Dyno Run
Got the dyno run completed. Couple of minor leaks around valve covers. Wound up going with 12 degrees @ idle, rev limiter off, 20 degree max advance arms with medium rate springs on the Pertronix dizzy. Only tested to 5k rpm cause I doubt I'll ever be running it there. Running a 750 cfm Edelbrock 1411. It's ok for street/daily driving but that's about it.
Power was still climbing on 2nd log run but starving on the A/F ratio with timing @ 6 degrees base. Plus the motor wouldn't idle.
Logs are from 3 runs from 1st to last. Left the motor per the 3rd run.
FWIW, a 1.5"x 3" patch of ceramic coating on the header (#6 cylinder) flaked off after the 2nd pull. Company said they'd recoat it but attributed the issue to an overhot cylinder. On a carb engine?
1 flex exhaust pipe blew apart during one of the runs and scared the living sh** out of me. I thought the motor blew up
Kinda like a 12ga going off about a foot from yer head...
Dan
Power was still climbing on 2nd log run but starving on the A/F ratio with timing @ 6 degrees base. Plus the motor wouldn't idle.
Logs are from 3 runs from 1st to last. Left the motor per the 3rd run.
FWIW, a 1.5"x 3" patch of ceramic coating on the header (#6 cylinder) flaked off after the 2nd pull. Company said they'd recoat it but attributed the issue to an overhot cylinder. On a carb engine?
1 flex exhaust pipe blew apart during one of the runs and scared the living sh** out of me. I thought the motor blew up
Kinda like a 12ga going off about a foot from yer head...Dan
Thread Starter
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Tuned
Joined: May 2010
Posts: 281
Likes: 9
From: Benton City, Wa
Now I just need a Dana 60 3:54/3:73 rearend change to get away from the Dana 60 4:10 in it.
I might wanna go more than 100 miles from home on less than 40 gals. of fuel. Now where's that darn rpm calculator......
Dan
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