SB towing engine thoughts... CARB HELP
#1730768
01/15/15 06:16 PM
01/15/15 06:16 PM
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HotRodDave
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Got a customer who had to sell his cummins and wants a motor in his 85 to perform similar and here is what I got coming to gether, what do you guys think?
340 block 4.070 4 inch stroke .512 lift [Email]230@.050[/Email] single pattern lunati hydro flat tappet R/T magnum heads, lightly ported Eddy RPM intake 650 Thunderseries Eddy 1 /5/8 summit brand headers Mahle pistons (really nice light weight, hard anodized teflon skirts!) Stock worked rods with ARP bolts 9.3 compression .040 quench but it is a smaller area than I like.
Anything I am missing or doing wrong?
Stock 12V cummins is what 190 HP 400 TQ? I am hoping to make 300HP and 500TQ at a low RPM range. Truck has 3.55s and 727 4x4.
Last edited by HotRodDave; 02/14/15 02:37 PM.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: SB towing engine thoughts...
[Re: HotRodDave]
#1730770
01/15/15 06:26 PM
01/15/15 06:26 PM
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MR_P_BODY
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Quote:
Got a customer who had to sell his cummins and wants a motor in his 85 to perform similar and here is what I got coming to gether, what do you guys think?
340 block 4.070 4 inch stroke .512 lift [Email]230@.050[/Email] single pattern lunati hydro flat tappet R/T magnum heads, lightly ported Eddy RPM intake 650 Thunderseries Eddy 1 /5/8 summit brand headers Mahle pistons (really nice light weight, hard anodized teflon skirts!) Stock worked rods with ARP bolts 9.3 compression .040 quench but it is a smaller area than I like.
Anything I am missing or doing wrong?
Stock 12V cummins is what 190 HP 400 TQ? I am hoping to make 300HP and 500TQ at a low RPM range. Truck has 3.55s and 727 4x4.
You cant compare the torque of the Cummins with that of the gas burner... the one is doing it at about 1000 rpms vs we will say 3800... will the gas burner fit the bill... it might DEPENDING on the load and if the conv is right
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Re: SB towing engine thoughts...
[Re: HotRodDave]
#1730771
01/15/15 06:30 PM
01/15/15 06:30 PM
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WO23Coronet
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That sounds more like 400+HP to me, wouldn't 230@.050 be a little big for a towing engine? Other than that it looks good to me
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Re: SB towing engine thoughts...
[Re: WO23Coronet]
#1730772
01/15/15 06:34 PM
01/15/15 06:34 PM
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MR_P_BODY
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Quote:
That sounds more like 400+HP to me, wouldn't [Email]230@.050[/Email] be a little big for a towing engine? Other than that it looks good to me
Not really.. the stroker will eat up some of that duration
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Re: SB towing engine thoughts...
[Re: MR_P_BODY]
#1730773
01/15/15 06:41 PM
01/15/15 06:41 PM
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HotRodDave
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Not too late to go one size smaller on the cam if it would be better I don;t think it would have too much cylinder pressure.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: SB towing engine thoughts...
[Re: HotRodDave]
#1730775
01/15/15 07:10 PM
01/15/15 07:10 PM
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HotRodDave
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I also have a 218@.050 .488 single pattern cam I could use. I can't find the Dunnuck 440 towing build, wanted to read that again, anyone save it?
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: SB towing engine thoughts...
[Re: Dunnuck Racing]
#1730778
01/15/15 07:25 PM
01/15/15 07:25 PM
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HotRodDave
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Do you have the dyno sheet or a link to the other thread?
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: SB towing engine thoughts...
[Re: Dunnuck Racing]
#1730779
01/15/15 07:29 PM
01/15/15 07:29 PM
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dogdays
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My : Magnum heads, use a single pattern cam. For low end torque, a tight LSA helps, especially if one chooses shorter durations. I think your cam choice is one or two steps too big. But looking at some dyno tests muddied the water. You may be at exactly the right place. Diesel torque curves have a different shape. Peak torque may be equal, but at lower rpm the Diesel should be way ahead. For example, this link gives you an idea. The 12-valve manual trans engine of the '90s had 320 lb-ft of torque at 500 rpm. http://dodgeram.org/tech/dsl/Facts/96specs.htmlR.
Last edited by dogdays; 01/15/15 07:56 PM.
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Re: SB towing engine thoughts...
[Re: HotRodDave]
#1730781
01/16/15 02:17 PM
01/16/15 02:17 PM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
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Quote:
Got a customer who had to sell his cummins and wants a motor in his 85 to perform similar and here is what I got coming to gether, what do you guys think?
340 block 4.070 4 inch stroke .512 lift [Email]230@.050[/Email] single pattern lunati hydro flat tappet R/T magnum heads, lightly ported Eddy RPM intake 650 Thunderseries Eddy 1 /5/8 summit brand headers Mahle pistons (really nice light weight, hard anodized teflon skirts!) Stock worked rods with ARP bolts 9.3 compression .040 quench but it is a smaller area than I like.
Anything I am missing or doing wrong?
Stock 12V cummins is what 190 HP 400 TQ? I am hoping to make 300HP and 500TQ at a low RPM range. Truck has 3.55s and 727 4x4.
I don't think a sb anything is going to proform similar to a diesel. No way no how and I wouldn't consider any sb for towing. My
I burned up a 360 motor(burnt 3 valves) towing a 26' enclosed trailer through the wimpy smokey mountains back in 1990. That was the last time I towed with a sb.
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Re: SB towing engine thoughts...
[Re: d100dragracer]
#1730783
01/16/15 05:41 PM
01/16/15 05:41 PM
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Joined: Jan 2005
Posts: 12,422 Kalispell Mt.
HotRodDave
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He pretty much ALWAYS has a 16 ft trailer with a small bob cat hooked up to it. A 12 valve cummins is $3500 just for the motor not to mention the cost of the conversion (trans, exhaust, fuel system...)or the fuel that is almost %50 more $ now so we are just trying to do the best we can with what we have. If the intake is a real question I do have a regular performer butt I was figuring with converter slipage that any more TQ below 2000 will never be used. He has mentioned that down the road he may get some 1.7 roller rockers to replace the stock 1.6 magnums we are going to use so he may get a little more lift out of it yet. The motor he was running the last two years in it was a JY 5.9 with a ring job, a couple cylinders had a little excesive taper, slightly ported factory magnum heads, air gap, same carb, exhaust, under 9.0 compression, no quench, the cam in it was a 222@.050 .540 lift roller but every couple months it would poke a hole through a stock rocker. Him and his buddy built it and it is ready to get rebuilt again. It was barely adequate. I would have tried pushing a 440 on him but then he still has to change a bunch of crap and push the cost up too high and a 340 stroker will hold more re-sale value if he can ever get back to a cummins truck.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: SB towing engine thoughts...
[Re: HotRodDave]
#1730786
01/30/15 08:40 PM
01/30/15 08:40 PM
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Joined: Oct 2003
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Crizila
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Maybe a smidgeon less duration. Otherwise, I like it. If he is towing under 10K gcw, should be just fine.
Fastest 300
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Re: SB towing engine thoughts...
[Re: HotRodDave]
#1730787
01/30/15 08:46 PM
01/30/15 08:46 PM
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dvw
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My old 360 1/2 ton had a stock intake, t-quad, and a Summit 214@.050 cam,3.23 it was pretty decent. The next 1/2 ton I replaced the 318 with a stock 5.9 Magnum with a Mopar Performance dual plane in place of the EFI,600 Holley, headers, and a 3.91 gear. It was very good except stopping. Doug
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