Re: Made it to the track, a little disappointed.
[Re: DrCharles]
#2951680
08/08/21 02:23 PM
08/08/21 02:23 PM
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Posts: 136 Ontario, Canada
500ciBee
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Yes, pretty much stock 383. The lift is almost identical to the cam that I took out. Same valve springs.
1970 Super Bee prostreet. 383, SMR 727, Dana 60 4:88. Building a 512 low deck.
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Re: Made it to the track, a little disappointed.
[Re: 500ciBee]
#2951695
08/08/21 02:53 PM
08/08/21 02:53 PM
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Joined: Aug 2019
Posts: 9,510 Super Spudsville
Mr PotatoHead
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IMO you just seeing real world street car 383 times. Id of even kept the older intake.
Cam specs tell a lot.
Brand: COMP Cams Manufacturer's Part Number: 21-227-4 Part Type: Camshafts Product Line: COMP Cams Xtreme Energy Hi-Lift Camshafts Summit Racing Part Number: CCA-21-227-4 UPC: 036584078319 Cam Style: Hydraulic flat tappet Basic Operating RPM Range: 2,000-5,800 Intake Duration at 050 inch Lift: 231 Exhaust Duration at 050 inch Lift: 237 Duration at 050 inch Lift: 231 int./237 exh. Advertised Intake Duration: 275 Advertised Exhaust Duration: 287 Advertised Duration: 275 int./287 exh. Intake Valve Lift with Factory Rocker Arm Ratio: 0.525 in. Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.525 in. Valve Lift with Factory Rocker Arm Ratio: 0.525 int./0.525 exh. Lobe Separation (degrees): 110 Camshaft Gear Attachment: 1-bolt Computer-Controlled Compatible: No Grind Number: CRB XE275HL-10 Valve Springs Required: Yes Quantity: Sold individually. Notes: Single-bolt camshaft.
STOP POTATO HATE!
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Re: Made it to the track, a little disappointed.
[Re: 500ciBee]
#2951735
08/08/21 04:00 PM
08/08/21 04:00 PM
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Joined: Feb 2006
Posts: 608 TN
1DGEMAN
mopar
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mopar
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Sounds like the valve springs are dead. Same springs from 8 years ago? How many miles?
Real Men shift for themselves
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Re: Made it to the track, a little disappointed.
[Re: 1DGEMAN]
#2951743
08/08/21 04:20 PM
08/08/21 04:20 PM
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The springs are probably 20 years old. Might have 1000 miles on them total. 8 passes that I've done. When I changed the cam I had a shop look over the springs and they were good. The open pressure was at the upper end of what the cam calls for.
1970 Super Bee prostreet. 383, SMR 727, Dana 60 4:88. Building a 512 low deck.
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Re: Made it to the track, a little disappointed.
[Re: 2264PLY]
#2951745
08/08/21 04:28 PM
08/08/21 04:28 PM
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My expectations weren't very high. Just thought by improving the 60" by a few tenths would lead to a few more tenths off at the end. 4.88 gears 33" tire 3500 stall Don't know what the weight is. Tubbed with a cage. Not much interior. Shifted at 5500 https://youtu.be/8xeiaGZZCdc
Last edited by 500ciBee; 08/08/21 04:38 PM.
1970 Super Bee prostreet. 383, SMR 727, Dana 60 4:88. Building a 512 low deck.
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Re: Made it to the track, a little disappointed.
[Re: 500ciBee]
#2951751
08/08/21 04:53 PM
08/08/21 04:53 PM
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Posts: 9,100 Rogue River, OR
Jeremiah
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I can see a stockksh 383 in a heavy car making 300 or so to the tire with that combo. The performer intake will definitely limit the power band in my experience. I would thinf the RPM would be good to at least 6500 on a stock stroke 383. While not 100% apples to apples my 451 with a comp 294h and 1.6's hits a wall at 5800 or so with a performer and stock 1968 bb a body manifolds with the exhaust corked or uncorked.. It acted the same with a performer RPM and headers on the dyno.
My advice would be a 125 or 150hp shot of nitrous. Keep the streetability 95% of the time. Change the timing and warm up that bottle and you are ready to party.
Last edited by Jeremiah; 08/08/21 04:57 PM.
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Re: Made it to the track, a little disappointed.
[Re: Hot 340]
#2951789
08/08/21 05:43 PM
08/08/21 05:43 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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Fast rate hyd cam = won’t rev. That’s your mechanical rev limiter. Especially with what’s out there for hyd lifters these days. A SFT is really a much better match for something that has the potential to run at higher rpm. That cam would make decent power, up to the rpm limit imposed by the lifters. Do you think the cam is solely to blame for the poor top end? Not so much the cam, as the lifters........ but the fast rate cam will find the limit of the lifters sooner than a cam with long slow lobes. Pull a couple of springs, measure the installed height, and have them tested. If they are 125-135 closed, 300-340 open...... they’re not your problem.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Made it to the track, a little disappointed.
[Re: Hot 340]
#2951797
08/08/21 05:50 PM
08/08/21 05:50 PM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
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That same cam and lifters in my 383/432 Stroker is done by 5400 RPMs
I have tried just about everything
Street Car - 1971 Superbee / Auto / 3:91 Sure Grip
Edelbrock E Street 75cc Heads
10.5-1 Compression
Most everyone I have talked to say , ( Hydraulic Lifters ) and Fast Ramp Camshaft
That’s all she wrote
Last edited by bee1971; 08/08/21 06:01 PM.
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: Made it to the track, a little disappointed.
[Re: jwb123]
#2951800
08/08/21 05:51 PM
08/08/21 05:51 PM
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I did a compression test in the spring and the highest was 190 the lowest 175. The rest were all about 180-185. I don't remember what timing I had back then but I have it set at a total of 35 now.
1970 Super Bee prostreet. 383, SMR 727, Dana 60 4:88. Building a 512 low deck.
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Re: Made it to the track, a little disappointed.
[Re: bee1971]
#2951802
08/08/21 05:53 PM
08/08/21 05:53 PM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
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Fast 68 beat me by 7 minutes
LOL
And he is one of the guys I talked to about Lifters with that Cam
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: Made it to the track, a little disappointed.
[Re: Hot 340]
#2951803
08/08/21 05:54 PM
08/08/21 05:54 PM
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Stock manifolds or headers? 1-7/8 Hooker long tube with 3" exhaust.
1970 Super Bee prostreet. 383, SMR 727, Dana 60 4:88. Building a 512 low deck.
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Re: Made it to the track, a little disappointed.
[Re: 500ciBee]
#2951805
08/08/21 05:57 PM
08/08/21 05:57 PM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
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I did a compression test in the spring and the highest was 190 the lowest 175. The rest were all about 180-185. I don't remember what timing I had back then but I have it set at a total of 35 now. I am at 195 psi cold on all eight cylinders 34 Degrees Total 5400 RPMs Dead
Last edited by bee1971; 08/08/21 05:58 PM.
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: Made it to the track, a little disappointed.
[Re: bee1971]
#2951806
08/08/21 05:59 PM
08/08/21 05:59 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
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Occasionally I read where someone has had success running a fast rate hyd cam with hyd lifters and carrying the power into the upper rpms.
Particularly in a BB application, in 31 years of dyno testing....... I have never experienced that. In any brand of engine.
Usually in a BB, they’re “done” before 6k.
Success at high rpm with a fast rate hyd cam/hyd lifters in a BB would be the rare exception..... rather than the rule.
All that being said........ that’s not to say that curing the high rpm capability of your motor would.......without changing anything else...........make huge impact on the ET.
If you have an adjustable valvetrain already, the down and dirty test/solution would be to install solid lifters on that cam and run the lash at like .004-.005. You’d need lifters and pushrods. Provided the springs are good, that would buy you somewhere between 700-1000 extra rpm.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Made it to the track, a little disappointed.
[Re: fast68plymouth]
#2951808
08/08/21 06:04 PM
08/08/21 06:04 PM
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Joined: May 2005
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500ciBee
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Fast rate hyd cam = won’t rev. That’s your mechanical rev limiter. Especially with what’s out there for hyd lifters these days. A SFT is really a much better match for something that has the potential to run at higher rpm. That cam would make decent power, up to the rpm limit imposed by the lifters. Do you think the cam is solely to blame for the poor top end? Not so much the cam, as the lifters........ but the fast rate cam will find the limit of the lifters sooner than a cam with long slow lobes. Pull a couple of springs, measure the installed height, and have them tested. If they are 125-135 closed, 300-340 open...... they’re not your problem. Thanks! I went with new but same lifters that the other cam used. Thought if it worked for that one then should work for the new cam. I posted pictures of the old cam in an old thread and you thought it was an MP cam. The springs are a dual spring and open pressures were quite high. The shop said it was about as much as they would run.
1970 Super Bee prostreet. 383, SMR 727, Dana 60 4:88. Building a 512 low deck.
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Re: Made it to the track, a little disappointed.
[Re: bee1971]
#2951809
08/08/21 06:06 PM
08/08/21 06:06 PM
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I did a compression test in the spring and the highest was 190 the lowest 175. The rest were all about 180-185. I don't remember what timing I had back then but I have it set at a total of 35 now. I am at 195 psi cold on all eight cylinders 34 Degrees Total 5400 RPMs Dead Ok thanks! That answers that. More incentive to start collecting parts for the stroker.
1970 Super Bee prostreet. 383, SMR 727, Dana 60 4:88. Building a 512 low deck.
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