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  #76 (permalink)  
Old 07-25-2013, 12:35 AM
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Quote:
Originally Posted by vinniekq2 View Post
what cam?
I want to guess too,lol.nice job
As for cam it's a comp cam xr282hr , gross valve lift is .510 / .520 duration @50 230 in /236 ex intake centre line is 106.0 and lobe separation angle 110.0 , with the 1.6 roller rockers lift will 544 in / 555 ex.

static compression is 10.017 and the dynamic effective compression ratio is 8.004.

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  #77 (permalink)  
Old 07-25-2013, 06:27 AM
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My HP guess is 475 around 58-6,000 RPM and 465 torque. depending on the support equipment and header tube size
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  #78 (permalink)  
Old 07-27-2013, 02:54 PM
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Nice build! Like the attention to detail
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  #79 (permalink)  
Old 07-27-2013, 04:44 PM
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Originally Posted by 67-4-fun View Post
Nice build! Like the attention to detail
thanks mate , i injoyed putting it togiver . just try to get the engine down to the dyno to get some numbers.
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  #80 (permalink)  
Old 07-27-2013, 09:24 PM
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A good friend of mine built him a 383 similar to yours for his 86 monticarlo. Only difference in my buddy build is he is running a Lunati solid flat tap cam 236/248@50 with 210 head, I took a ride with him and engine pulls hard all way through 6500 rpm.. I'm guessing his is around 480 hp
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  #81 (permalink)  
Old 07-28-2013, 04:58 PM
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Originally Posted by 67-4-fun View Post
A good friend of mine built him a 383 similar to yours for his 86 monticarlo. Only difference in my buddy build is he is running a Lunati solid flat tap cam 236/248@50 with 210 head, I took a ride with him and engine pulls hard all way through 6500 rpm.. I'm guessing his is around 480 hp
i'm hoping for 480hp or more , will found out soon.
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  #82 (permalink)  
Old 08-06-2013, 06:23 PM
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i'm hoping for 480hp or more , will found out soon.

hi every one , got the numbers. I must say I was disappointed , next time will look at a different cam as it was to small for the combo. anyway it made 450hp @ 5500 rpm and 457.6 tq @4400 rpm.

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  #83 (permalink)  
Old 08-06-2013, 08:20 PM
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missed the torque bu 8 and HP by 25,thats close.
How many pulls did you make?a tuning session always fids some power.The dyno headers look a little big for your engine?

did you try any spacers? a spacer tells a big story. What final timing does your engine like?
what was the S.F.C.? What did you set the air /fuel ratio for your application? 12.2 ish:1 is good for power using a carb
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  #84 (permalink)  
Old 08-07-2013, 01:51 AM
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Originally Posted by vinniekq2 View Post
missed the torque bu 8 and HP by 25,thats close.
How many pulls did you make?a tuning session always fids some power.The dyno headers look a little big for your engine?

did you try any spacers? a spacer tells a big story. What final timing does your engine like?
what was the S.F.C.? What did you set the air /fuel ratio for your application? 12.2 ish:1 is good for power using a carb
they only did a couple of pulls , carb was to lean as had to up the jets to 76 in the front and they left 83 in the rear. could not run the vacuum on the dizzy as it was going to avd in timing , so they lock it out. on the paper they put 32 for total timing so not really sure. did put a 1 inch spacer on but it lose 10 hp. not to sure what s.f.c is. air/fuel ratio was 13:1 @ idle and 11.8:1 @wot . there was so much more they could have done , just poor work man ship. I still think it not dailed in right.
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  #85 (permalink)  
Old 08-07-2013, 05:51 AM
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sfc= specific fuel consumption
this is how many pounds of fuel per h.p. produced,example, .40

this means that every hp produced will use .4 pounds of fuel per hour. So if you were making 100 hp,your engine would burn 40 pound of fuel(about 7 gallons per hour)while making 100 horse power.
This number I check to make sure its not too high(indicates problems)
you W.O.T. mixture of 11.8:1 is too rich (except for maybe a blower)

Doesnt look like you got a dyno tune so much as a dyno test
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  #86 (permalink)  
Old 08-07-2013, 05:58 AM
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also I just went back and noticed the hp is lower than the torque at 5500 rpm?tuning is still off or the HP graph just fell on its face at 5k?
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  #87 (permalink)  
Old 08-07-2013, 07:34 AM
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Quote:
Originally Posted by bjautos7 View Post
they only did a couple of pulls , carb was to lean as had to up the jets to 76 in the front and they left 83 in the rear. could not run the vacuum on the dizzy as it was going to avd in timing , so they lock it out. on the paper they put 32 for total timing so not really sure. did put a 1 inch spacer on but it lose 10 hp. not to sure what s.f.c is. air/fuel ratio was 13:1 @ idle and 11.8:1 @wot . there was so much more they could have done , just poor work man ship. I still think it not dailed in right.
Looks like you got "taken for a ride" on that dyno "tune". Not really a tune at all but a half assed spin. I hope you didn't pay much for that. You may have 20hp or so still left in this thing by getting a good tune. You'll definitely pick up that 8ftlb you're looking for.
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  #88 (permalink)  
Old 08-08-2013, 08:04 AM
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Did you get a chart of RPM/HP/Torque from the shop? I'm curious about the curves, and how you mentioned the HP fell off drastically after about 5000 RPM. I'm just getting started with a similar build, and these numbers are about what I'm shooting for, maybe a bit more. Interesting reading, and lots of good info in this thread!
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  #89 (permalink)  
Old 08-13-2013, 06:11 PM
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ok this what they give me , have alook over it and see what you think.







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  #90 (permalink)  
Old 08-14-2013, 12:33 AM
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no sfc and no AF ratios?not right!
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