Best Blower Cam!
PSJ, what was the lowest boost you dynoed that cam with and where did the power peaks fall and with what motor/heads/headunit?
I had a cam ground a month ago for a procharged truck in that neighborhood, and wondering where it may peak at. In a 6.0, thats seeing nitrous too so much of a balancing act going on
I had a cam ground a month ago for a procharged truck in that neighborhood, and wondering where it may peak at. In a 6.0, thats seeing nitrous too so much of a balancing act going on
I did 738rwhp safely @ 17 psi with:
230/236//115
YS Trim
17 psi
110L
Mine is T400, but peaked like at 6800. I forget exactly.
With an unlocked T400 the peaks will be a few hundred rpms on the dyno than reality depending on the looseness of the converter.
I will say that my current combo is less like a mountain and more like a plain. I make over 700rwhp by 5800 rpms now.
230/236//115
YS Trim
17 psi
110L
Mine is T400, but peaked like at 6800. I forget exactly.
With an unlocked T400 the peaks will be a few hundred rpms on the dyno than reality depending on the looseness of the converter.
I will say that my current combo is less like a mountain and more like a plain. I make over 700rwhp by 5800 rpms now.
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I haven't contacted comp yet, been trying to get ahold of cylinder head specialties. Anyways my pulley is a 3.2 and they said if I can't go smaller w/o a larger crank pulley? Also the 11.65 is w/o the s/c and fuel system I have now so I should be in the 10's. Thank you all for helping, still trying to understand some of it!
Originally Posted by Pro Stock John
Old: 230/236//115//595/598
New: 236/246//114/598/632
New: 236/246//114/598/632
Thanks
Last edited by 1bad2k2ta; Mar 22, 2005 at 07:56 AM.
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Originally Posted by ls1290
236/245//598//612//115+0 in a 402 with a F1-R procharger 
Keith
Keith
Thanks
No you can make a cam that size drive pretty good even in a 346. Its not really necessary for your average 9 psi car setup though
John much advance as in both cams? Normally on blower stuff I run them close to straight up. This one is in a few degrees forward, just because of the stock bottom, and dont know about it at 7000 rpm. For the real shortblock just going to retard it a couple degrees
John much advance as in both cams? Normally on blower stuff I run them close to straight up. This one is in a few degrees forward, just because of the stock bottom, and dont know about it at 7000 rpm. For the real shortblock just going to retard it a couple degrees
I consider the 235/245 stuff like ls1290 and I have to be stage III stuff:
Stage I: 210/220
Stage II: 220/230
Stage III: 230/240
Stage IV: 240/250
Drives fine. I've had bigger in the past in my old stroker.
High lift can be problematic, I plan to change valve springs once a year.
I'm not sure I can make the same generalization as gotmesom. I would say that my cam is big for stock cubes, but with my combo, which is a low compression 348ci with a 1600 cfm supercharger, I was looking for as much power as possible by 7200 rpms. That is what I have. We also wanted to get my average horsepower over 700rwhp. I have that too. I made a peak of 754rwhp at 6600. I made over 700rwhp by 5700. Since I have a 10" converter, is it safe to say that a car that makes 700rwhp at 5700 and 754rwhp at 6600 is going to be faster than a car that makes 600rwhp at 5700 and 754rwhp at 6600?
Please keep in mind that a blower setup's powerband is dictated by the interplay of the folllowing:
-blower size
-pulley combo
-engine timing
-engine size
-exhaust size
-converter/ transmission setup
-cam size
-intake manifold
Stage I: 210/220
Stage II: 220/230
Stage III: 230/240
Stage IV: 240/250
Drives fine. I've had bigger in the past in my old stroker.
High lift can be problematic, I plan to change valve springs once a year.
I'm not sure I can make the same generalization as gotmesom. I would say that my cam is big for stock cubes, but with my combo, which is a low compression 348ci with a 1600 cfm supercharger, I was looking for as much power as possible by 7200 rpms. That is what I have. We also wanted to get my average horsepower over 700rwhp. I have that too. I made a peak of 754rwhp at 6600. I made over 700rwhp by 5700. Since I have a 10" converter, is it safe to say that a car that makes 700rwhp at 5700 and 754rwhp at 6600 is going to be faster than a car that makes 600rwhp at 5700 and 754rwhp at 6600?
Please keep in mind that a blower setup's powerband is dictated by the interplay of the folllowing:
-blower size
-pulley combo
-engine timing
-engine size
-exhaust size
-converter/ transmission setup
-cam size
-intake manifold
Originally Posted by Pro Stock John
I consider the 235/245 stuff like ls1290 and I have to be stage III stuff:
Stage I: 210/220
Stage II: 220/230
Stage III: 230/240
Stage IV: 240/250
Drives fine. I've had bigger in the past in my old stroker.
High lift can be problematic, I plan to change valve springs once a year.
I'm not sure I can make the same generalization as gotmesom. I would say that my cam is big for stock cubes, but with my combo, which is a low compression 348ci with a 1600 cfm supercharger, I was looking for as much power as possible by 7200 rpms. That is what I have. We also wanted to get my average horsepower over 700rwhp. I have that too. I made a peak of 754rwhp at 6600. I made over 700rwhp by 5700. Since I have a 10" converter, is it safe to say that a car that makes 700rwhp at 5700 and 754rwhp at 6600 is going to be faster than a car that makes 600rwhp at 5700 and 754rwhp at 6600?
Please keep in mind that a blower setup's powerband is dictated by the interplay of the folllowing:
-blower size
-pulley combo
-engine timing
-engine size
-exhaust size
-converter/ transmission setup
-cam size
-intake manifold
Stage I: 210/220
Stage II: 220/230
Stage III: 230/240
Stage IV: 240/250
Drives fine. I've had bigger in the past in my old stroker.
High lift can be problematic, I plan to change valve springs once a year.
I'm not sure I can make the same generalization as gotmesom. I would say that my cam is big for stock cubes, but with my combo, which is a low compression 348ci with a 1600 cfm supercharger, I was looking for as much power as possible by 7200 rpms. That is what I have. We also wanted to get my average horsepower over 700rwhp. I have that too. I made a peak of 754rwhp at 6600. I made over 700rwhp by 5700. Since I have a 10" converter, is it safe to say that a car that makes 700rwhp at 5700 and 754rwhp at 6600 is going to be faster than a car that makes 600rwhp at 5700 and 754rwhp at 6600?
Please keep in mind that a blower setup's powerband is dictated by the interplay of the folllowing:
-blower size
-pulley combo
-engine timing
-engine size
-exhaust size
-converter/ transmission setup
-cam size
-intake manifold
Not sure I fully understand what you mean here.
I think I get this, that is one reason I was curious about your stall speed and gears, which you never stated. I am thinking you must be running a 4000+ converter. Driving around town, you must be creating a lot of heat with a stall that loose.
Let's see how well I get this part.
-blower size - determines total possible cfm = max power - should produce cfms necessary to reach power goals without maxing the blower - overdriving causes excessive heat and likelyhood of detonation
-pulley combo - determines max cfm at peak power
-engine timing - a little fuzzy on this one - determines power @rpm vs knock?
-engine size - affects VE - longer stroke=more low end torque, higher piston speed, greater chance of knock at higher rpms - bigger bore=more top end hp, requires higher rpms to make power
-exhaust size - determines resistance to exhaust flow
-converter/transmission setup - should be configured to keep the engine within its peak power band for max effort
-cam size - determines overall powerband and torque/hp peaks
-intake manifold - determines resistance to intake flow/velocity - runner length/diameter
Please correct me where I have missed it and elaborate on the finer points of how these things work together or wherever things seem unclear.
Thanks for your patience.
I am running a 10" converter, and it stalls over 4500. I am running 3.50 gears and 28" slicks. I am running a B&M 28,000 gvw race trans cooler.
I would say that I am running a big power blower cam. My max rpm has always been 7200, even with the smaller cam I had.
You can adjust a given combo by changing the pulley combination, changing the cam, and changing the torque converter. All three of those components will have a major effect on how, where, when a combo makes power.
You pretty much should start with your rev limiter.
As an aside, I could pulley down more and make another 20-50rwhp but my tensioner setup probably would probably have problems with a smaller blower pulley. The Mustang guys are playing with 2.75's and 2.80's and I am running a 2.85.
I would say that I am running a big power blower cam. My max rpm has always been 7200, even with the smaller cam I had.
You can adjust a given combo by changing the pulley combination, changing the cam, and changing the torque converter. All three of those components will have a major effect on how, where, when a combo makes power.
You pretty much should start with your rev limiter.
As an aside, I could pulley down more and make another 20-50rwhp but my tensioner setup probably would probably have problems with a smaller blower pulley. The Mustang guys are playing with 2.75's and 2.80's and I am running a 2.85.
220230, 402, a121clyahoocom, blower, cam, camshaft, converter, erson, f1c, headflow, ls1, lt1, procharger, recommended, speed, stall, supercharged, supercharger
