[Marcs66and06]

Sorry it took so long gang...finally after hunting down some miscellanous parts and whatknot we finally got it all put together....the shop ran the engine and she made some pretty good power. Here are the scans. Max hp 498 max trq 426.

The engine spec build is:

750 dbl pumper hp race series-rejetted
vic jr
1" spacer
tfs r heads
solid roller cam
Je flat top pistons
main stud girdle
8 qt rear sump oil pan

Shes bored 40 over and runs like a scared dog now I can start working on the rest of the car--ughh trans and rear end.

 

[6t9mach1]

Nice numbers. What rpm did the cam grinder say it was suppose to peak at? It looks like its doing some funky things up top. I would think that with that duration that cam should make peak higher than it did. Did you ever do a pull from a lower rpm or did they all start at 4k?

 

[Marcs66and06]

We did some pulls from lower rpms. I dont know what the peak was supposed to be for the cam...but the lower rpms had the same graph flow for numbers...you think something looks off?

 

[shaneh]

I do agree that it seems to peak a bit low. I'd be interested in seeing the cam timing events. My guess is it's a pretty mild cam with low overlap. I've got a 11:1 347 here with twisted wedge street heads and a solid roller that has an additional 500rpm of rev range in comparison to that graph. It makes peak power at 7200 and gets shifted at 7500.

 

[buening]

The torque definitely peaks too early on that motor with those enormous heads. It should be climbing along with the horsepower to at least 6500rpm before decreasing. Were you able to get A/F ratios during the dyno pull? I'm wondering if it isn't going lean or the pump isn't getting it enough fuel?

 

[Marcs66and06]

The a/f ratios are all on the second page....bunch of numbers to me.

 

[buening]

If you want, scan in the second page that has the a/f ratios.

 

[sportsroof69]

The torque definitely peaks too early on that motor with those enormous heads. It should be climbing along with the horsepower to at least 6500rpm before decreasing. Were you able to get A/F ratios during the dyno pull? I'm wondering if it isn't going lean or the pump isn't getting it enough fuel?

I was thinking the same thing....

 

[6t9mach1]

What size fuel pump and fuel line are you running?

 

[Marcs66and06]

The fuel pump was the one on the engine dyno machine(have no clue) so it was running directly to the carb...so thats eliminated. The car has 3/8inch line.