Cam Recommendation
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Cam Recommendation
All,
I recieved a recommendation from Comp on a cam for my engine build. I would like some educated opinions on that. Thanks
I have a cam that I think would work well for you. It is 08-468-8. The rpm range is 2200-6200. Duration @ .050 is 242 248 with valve lift of .584 .579. We need to change a few things about the cam though. We would need to put it on a small base circle to make sure you have ptv clearance. We may also want to widen the LSA to 114 to help with the nitrous when you spray.
Camshaft Recommendation Request
Note To Customer: The information below has been received by CAM Help� tech support. This email is for your records.
CONTACT INFORMATION
First Name:
Doug
Email:
dwsatterfield@yahoo.com
Last Name:
Satterfield
Day Phone: (8am-5pm CST)
479-670-4139
VEHICLE INFORMATION
Make:
Pontiac
Model:
Trans Am
Year:
1997
Weight:
4000 lbs.
Axle Ratio:
4.10
Transmission Type:
Manual
Overall Tire Height:
25.66
Torque Converter Stall Speed:
NA
ENGINE INFORMATION
Engine Block Type:
Chevrolet
Engine Family:
Chevrolet V8 265-400 1957-1998 with 1.5 Rockers
Engine Size:
383 c.i.
Number of Cylinders:
8
Bore:
4.30
Stroke:
3.75
Compression Ratio:
11:1:0 tenative
Connecting Rod Length:
6.00
Intake Manifold Type:
LT4 ported
Cylinder Head(s) Brand:
TEA/Trick Flow
Head Runner Volume:
205 cc
Ported Heads:
Yes
Intake Valve Size:
2.02
Exhaust Valve Size:
1.60
Rocker Arm Type:
Full Roller
Rocker Arm Ratio
1.6:1
Exhaust Headers:
Yes
RPM Range Low:
2000
RPM Range High:
6500
Nitrous Oxide:
Yes
Horsepower from Nitrous:
200 hp
COMPUTER CONTROLLED VEHICLES
Vehicle Computer Type:
Stock
Speed Density Sensor:
No
Mass Air Sensor:
Yes
FUEL DELIVERY
Fuel Type:
Pump Gas
Fuel Octane Rating:
94
Carburetor:
No
Carburetor Size:
N/A
Direct Port Injection:
No
Electronic Fuel Injection:
Yes
Custom Tuned:
No
AIR DELIVERY
Turbo Charger:
No
Supercharger:
No
Max Boost Level:
N/A
APPLICATION SPECIFICS
Application Type:
Street & Strip
Other Application Type:
N/A
Race Class (If Applicable):
N/A
VALVE TRAIN SPECIFICS
Desired Lifter Type:
Hydraulic Roller
Type: OE Hyd. Roller Engine
What type of camshaft are you currently using?
Camshaft Brand:
None
Part Number:
N/A
Specs:
N/A
Considering the current peformance of your vehicle, do you need:
More Low Speed Torque?
Yes
More RPM?
Yes
Is Idling Speed Important?
Yes
Is Emissions Compliance
Important?
No
Does Your Vehicle Currently Use the Following:
Air Conditioning?
No
Power Steering?
Yes
Power Brakes?
Yes
ADDITIONAL INFORMATION:
I am building this engine from the grounnd up to replace my bolt on stocker. The vehicle is used on weekends exclusively. I would like it to be a street monster. It will be run at the track maybe once or twice a year(its been over three since I've had it there). The nitrous will be seldom used. Pretty much only when racing. The bottom end is all forged, 4bolt splayed and should take anything that I throw at it. Email is the best way to get in touch with me. Please let me know if there is any other info that will be helpful for a good recommendation. Thank you for your help.
I recieved a recommendation from Comp on a cam for my engine build. I would like some educated opinions on that. Thanks
I have a cam that I think would work well for you. It is 08-468-8. The rpm range is 2200-6200. Duration @ .050 is 242 248 with valve lift of .584 .579. We need to change a few things about the cam though. We would need to put it on a small base circle to make sure you have ptv clearance. We may also want to widen the LSA to 114 to help with the nitrous when you spray.
Camshaft Recommendation Request
Note To Customer: The information below has been received by CAM Help� tech support. This email is for your records.
CONTACT INFORMATION
First Name:
Doug
Email:
dwsatterfield@yahoo.com
Last Name:
Satterfield
Day Phone: (8am-5pm CST)
479-670-4139
VEHICLE INFORMATION
Make:
Pontiac
Model:
Trans Am
Year:
1997
Weight:
4000 lbs.
Axle Ratio:
4.10
Transmission Type:
Manual
Overall Tire Height:
25.66
Torque Converter Stall Speed:
NA
ENGINE INFORMATION
Engine Block Type:
Chevrolet
Engine Family:
Chevrolet V8 265-400 1957-1998 with 1.5 Rockers
Engine Size:
383 c.i.
Number of Cylinders:
8
Bore:
4.30
Stroke:
3.75
Compression Ratio:
11:1:0 tenative
Connecting Rod Length:
6.00
Intake Manifold Type:
LT4 ported
Cylinder Head(s) Brand:
TEA/Trick Flow
Head Runner Volume:
205 cc
Ported Heads:
Yes
Intake Valve Size:
2.02
Exhaust Valve Size:
1.60
Rocker Arm Type:
Full Roller
Rocker Arm Ratio
1.6:1
Exhaust Headers:
Yes
RPM Range Low:
2000
RPM Range High:
6500
Nitrous Oxide:
Yes
Horsepower from Nitrous:
200 hp
COMPUTER CONTROLLED VEHICLES
Vehicle Computer Type:
Stock
Speed Density Sensor:
No
Mass Air Sensor:
Yes
FUEL DELIVERY
Fuel Type:
Pump Gas
Fuel Octane Rating:
94
Carburetor:
No
Carburetor Size:
N/A
Direct Port Injection:
No
Electronic Fuel Injection:
Yes
Custom Tuned:
No
AIR DELIVERY
Turbo Charger:
No
Supercharger:
No
Max Boost Level:
N/A
APPLICATION SPECIFICS
Application Type:
Street & Strip
Other Application Type:
N/A
Race Class (If Applicable):
N/A
VALVE TRAIN SPECIFICS
Desired Lifter Type:
Hydraulic Roller
Type: OE Hyd. Roller Engine
What type of camshaft are you currently using?
Camshaft Brand:
None
Part Number:
N/A
Specs:
N/A
Considering the current peformance of your vehicle, do you need:
More Low Speed Torque?
Yes
More RPM?
Yes
Is Idling Speed Important?
Yes
Is Emissions Compliance
Important?
No
Does Your Vehicle Currently Use the Following:
Air Conditioning?
No
Power Steering?
Yes
Power Brakes?
Yes
ADDITIONAL INFORMATION:
I am building this engine from the grounnd up to replace my bolt on stocker. The vehicle is used on weekends exclusively. I would like it to be a street monster. It will be run at the track maybe once or twice a year(its been over three since I've had it there). The nitrous will be seldom used. Pretty much only when racing. The bottom end is all forged, 4bolt splayed and should take anything that I throw at it. Email is the best way to get in touch with me. Please let me know if there is any other info that will be helpful for a good recommendation. Thank you for your help.
#2
TECH Fanatic
iTrader: (1)
I'd completely disregard that recommendation.
That "tech" at Comp or whatever he/she is, is clueless about powerband in an LT1 and about nitrous applications. A 200 shot on a 383 is not nitrous cam territory and does not call for any departure from what you'd choose for your "street monster" NA use. You wouldn't make use of that cam's powerband with a stock PCM.
For your stated minimal track use, I think you want to target some lower duration numbers, maybe mid 130's, to get a more useable powerband for a street brawler. Numbers are just generalizations though.
Letting AI or LE spec a cam for you is going to put you miles ahead of relying on some "tech" at a company like Comp, and will bypass the bias you'll get on here from albeit knowledgable folks who have had success in their OWN applications. And I'll be the first to admit I fall into that category.
That "tech" at Comp or whatever he/she is, is clueless about powerband in an LT1 and about nitrous applications. A 200 shot on a 383 is not nitrous cam territory and does not call for any departure from what you'd choose for your "street monster" NA use. You wouldn't make use of that cam's powerband with a stock PCM.
For your stated minimal track use, I think you want to target some lower duration numbers, maybe mid 130's, to get a more useable powerband for a street brawler. Numbers are just generalizations though.
Letting AI or LE spec a cam for you is going to put you miles ahead of relying on some "tech" at a company like Comp, and will bypass the bias you'll get on here from albeit knowledgable folks who have had success in their OWN applications. And I'll be the first to admit I fall into that category.
#3
11 Second Club
iTrader: (1)
The Comp rpm ranges are completely wrong and seem to be based on gen 1 longer runner intake manifolds. Expect it to peak at or above the 6500 you are hoping to use as a limiter and need to go all the way to 7000.
The idea of spreading the LSA further from it already too ******* wide point for a little 200 shot just adds more evidence of the incompetence with which this cam was recommended.
11:1 compression is too low, most heads/cam cars run more and nitrous likes compression just fine remember is drastically lowers IAT, Boost on the otherhand raises IAT which is part of why it needs low compression and for some reason people like to missapply that idea to nitrous.
Whatever incompetent you are getting your guidance from and half of this forum will all argue with me BUT.
https://ls1tech.com/forums/lt1-lt4-m...ast-night.html
Pretty sure that cam is lower duration and tighter LSA and this is with lowly ported GM heads and LT1 intake.
That car is also genuinely over 4000lbs not pretend 4000lbs like you told them your car was.
The idea of spreading the LSA further from it already too ******* wide point for a little 200 shot just adds more evidence of the incompetence with which this cam was recommended.
11:1 compression is too low, most heads/cam cars run more and nitrous likes compression just fine remember is drastically lowers IAT, Boost on the otherhand raises IAT which is part of why it needs low compression and for some reason people like to missapply that idea to nitrous.
Whatever incompetent you are getting your guidance from and half of this forum will all argue with me BUT.
https://ls1tech.com/forums/lt1-lt4-m...ast-night.html
Pretty sure that cam is lower duration and tighter LSA and this is with lowly ported GM heads and LT1 intake.
That car is also genuinely over 4000lbs not pretend 4000lbs like you told them your car was.
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What in the world would a small base circle have to do with valve to piston clearance??????
ptv clearance is about actual lift at different given durations. Small base circle or stock base circle, it would still be the same if the lobe lift is the same. Why does this person have a job answering tech questions at Comp or any cam company? Maybe it's a typo and they meant to say cam to connecting rod clearance since it's a stroker and sometimes that is a problem. ???
ptv clearance is about actual lift at different given durations. Small base circle or stock base circle, it would still be the same if the lobe lift is the same. Why does this person have a job answering tech questions at Comp or any cam company? Maybe it's a typo and they meant to say cam to connecting rod clearance since it's a stroker and sometimes that is a problem. ???
#7
11 Second Club
iTrader: (1)
The 280 would be a better choice with his self imposed 6500rpm limit, still though with a little 200 shot I would keep the LSA tighter unless emissions was a concern.
Generally you don't need to start thinking about a "nitrous grind" till 250+ shot. For a 200 shot I might add a couple more degrees exhaust duration but would not be spreading the LSA because spreading the LSA hurts peak torque and NA performance.
Most of the quick NA hydraulic cars run 107-110LSA.
Before someone jumps is in Yes I know LSA is not the most critical aspect it is valve events and overlap you are looking for, but the easiest shadetree way to talk about it is LSA.
Generally you don't need to start thinking about a "nitrous grind" till 250+ shot. For a 200 shot I might add a couple more degrees exhaust duration but would not be spreading the LSA because spreading the LSA hurts peak torque and NA performance.
Most of the quick NA hydraulic cars run 107-110LSA.
Before someone jumps is in Yes I know LSA is not the most critical aspect it is valve events and overlap you are looking for, but the easiest shadetree way to talk about it is LSA.
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#8
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Right, The LSA is usually a function or result of the desired cam specs. Opening up an "established" cam can have adverse affects on the power curve.
I also agree that a wide LSA is not needed on a relatively average shot of nitrous.
I also agree that a wide LSA is not needed on a relatively average shot of nitrous.
#9
12 Second Club
iTrader: (3)
I applaud you for asking an opinion on a part BEFORE you bought it. Too many times on this forum people ask for opinions AFTER, and then get all butt hurt when people tell them it was a stupid purchase. You need to have someone who specializes in LT engines spec a cam, and your compression ratio. Not someone who is used to gen 1 sbcs.
#10
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I applaud you for asking an opinion on a part BEFORE you bought it. Too many times on this forum people ask for opinions AFTER, and then get all butt hurt when people tell them it was a stupid purchase. You need to have someone who specializes in LT engines spec a cam, and your compression ratio. Not someone who is used to gen 1 sbcs.
#11
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But seriously, yes, that was just another indicator that the "tech" didn't know his **** from a hole in the ground.