| View previous topic :: View next topic |
| Author |
Message |
555nova
Member
Joined: 20 Feb 2008
Posts: 62
2155.50 points
1974 Chevrolet Nova
|
 Posted: Thu Mar 11, 2010 11:40 pm Post subject: what will it make? |
 |
|
I haven't posted around here for a while, I forgot what a great site this is.
So over the winer I redid the top end of the motor because Im need to pick up about .4 to run an index class next year. I do realize Im not going to pick up the whole amount on the motor so I will be adding a plate system too.
Here is the before/after specs on the engine, how much hp do you think I will make now?
old set up 775hp
555" 13.5 comp
286/296@.050 .724/.714 110 lsa
otb dart pro1 345
otb dart 4500 intake
1250 dominator
new set up
555" 13.5 comp
283/297@.050 .825/.775 113 lsa
CFM perf. ported 365cc pro1's flow around 425 @ .800
ported super victor intake
1250 dominator.
what kind of power do you guys think I picked up, thanks Jason |
|
| Back to top |
|
 |
Paul P
Member
Joined: 15 Aug 2002
Posts: 1945
Location: Townsend, Mass.
67030.90 points
1971 Chevrolet Chevelle
|
| Posted: Fri Mar 12, 2010 12:24 pm Post subject: |
|
|
I calculated the power based on airflow and CU IN. If the head is the limiting factor to maximize power it says 873.81HP @ 8054rpm.
_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
 |
|
| Back to top |
|
|
555nova
Member
Joined: 20 Feb 2008
Posts: 62
2155.50 points
1974 Chevrolet Nova
|
| Posted: Sat Mar 13, 2010 2:34 pm Post subject: |
|
|
Thats about the power I was hoping for, but wow thats a lot of rpm. I have my rev limiter set a 8k  |
|
| Back to top |
|
|
Big Dave
Moderator
Joined: 04 Dec 2005
Posts: 2437
Location: Tampa Florida
111706.68 points
|
| Posted: Sun Mar 14, 2010 12:12 am Post subject: |
|
|
| 555nova wrote: | | Thats about the power I was hoping for, but wow thats a lot of rpm. I have my rev limiter set a 8k |
I think Paul ran it through a desk-top dyno using your flow numbers and cam and that is where it peaked in HP. You usually shift above peak to keep RPM between peak torque and HP so it wouldn't be unheard of carrying your shift point 400 to 600 RPM past peak HP to try and wring out what you can if your heads and valve train can support it.
I was listening to Darian Morgan while driving up to watch the Gatornationals Qualifying (and the Finals of the Previous race called on account of rain) and he states he gets only 7 runs at 9,600 RPM and yet can make nearly 25 runs at 9,300 RPM with their store bought Comp motors they sell (Raptor heads) so every RPM makes a difference in BBC spring life.
Big Dave |
|
| Back to top |
|
|
555nova
Member
Joined: 20 Feb 2008
Posts: 62
2155.50 points
1974 Chevrolet Nova
|
| Posted: Tue Jul 27, 2010 7:05 pm Post subject: |
|
|
I finally got to the track to see what I picked up if anything. The car did pick up around .3 and almost 4 mph over my typical pass from last year at the same track in roughly the same weather conditions (7500'D.A.)
It went from running high 10.1x's@ 134 mph to running a 9.81@ 138. This was the first race of the year at the track and it has been very wet in the area, so the track was less than ideal. My 60's were off almost a full tenth..1.40 vs. 1.32. I hope with a better track to maybe nock off another tenth.
I never considered it before, but I think I need to go up to a 29.5x10.5 tire because I was turning almost 7500 rpm through the traps and would like 7000 rpm a little better, its a was built to turn 8000+ but I dont see the need for it. |
|
| Back to top |
|
|
|
FAQ
Search
Register
Log in
Log in to check your private messages
