Re: Moroso underdrive pulley on the street?
[Re: BradH]
#2637875
03/27/19 09:02 PM
03/27/19 09:02 PM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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With your high RM cruising speed you wouldn't even be slowing the accessories down to what a modern system would have. I'd try it.
Boffin Emeritus
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Re: Moroso underdrive pulley on the street?
[Re: BradH]
#2637941
03/28/19 01:00 AM
03/28/19 01:00 AM
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Joined: Jan 2003
Posts: 8,028 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,028
Tulsa OK
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I run an electric water pump but I have had zero charging issues with a 5" pulley on my car. GM CS130 alternator, two electric fuel pumps, electric water pump, two electric fans, fuel cooler fan, Fuel Injection, street car. It can still keep up with the lights and wipers on as well.
68 Barracuda Formula S 340
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Re: Moroso underdrive pulley on the street?
[Re: BradH]
#2637962
03/28/19 07:45 AM
03/28/19 07:45 AM
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Joined: Jan 2003
Posts: 17,892 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,892
S.E. Michigan
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I'm using one. The nicer dark blue billet style they discontinued (they didn't make them for very long...they're not easy to find...so I collect them, so far have only found two). You will probably be fine as long as you don't experiment with additional electric accessories. The charging system will be at it's limit with what little draw it has. Idle with the headlights on is pushing it. I use the same 5 blade fan, but went to a much tighter RV clutch due to low speed cooling concerns. (not verified problems...just concerns). I'm not 100% sure if the loose/power saving MP fan clutch (6 cylinder van application if I remember correctly?) will be adequate for you when spun at lower rpm. I think it will probably be fine but that is something to keep an eye on. Overall I'd say you are probably good to go.....but....."it depends" "You have to test on your specific combination and...." You already know the rest
Last edited by ZIPPY; 03/28/19 07:47 AM.
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Re: Moroso underdrive pulley on the street?
[Re: ZIPPY]
#2637981
03/28/19 08:57 AM
03/28/19 08:57 AM
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Joined: Jan 2003
Posts: 7,495 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,495
Minnesota
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Imho, on the street, if you have enough motor, the power freed up by a pully swap will be too insignificant to notice. If you're not blowing away the tires, your motor is too small and the pulley won't change that.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Moroso underdrive pulley on the street?
[Re: Hemi_Joel]
#2638032
03/28/19 11:16 AM
03/28/19 11:16 AM
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Joined: Jan 2003
Posts: 4,296 Chicago, IL
TonyS451
master
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master
Joined: Jan 2003
Posts: 4,296
Chicago, IL
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Brad - I tried an underdrive pulley on my old 63 4 door w the 512" and I did not have success with cooling. It had a stock BB radiator, flex fan w/shroud and it could not keep up. I switched back to stock pulley and cooling issues went away. Matter of fact, I realized the cooling issues when I was driving to the track. Part way there I pulled over to let it cool down and then limped it back home. I never did get to find out what it was worth on the timeslip. It might have worked with a better cooling system, who knows.
2 kids and a dog
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Re: Moroso underdrive pulley on the street?
[Re: BradH]
#2638095
03/28/19 01:36 PM
03/28/19 01:36 PM
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Joined: Jan 2003
Posts: 13,376 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,376
Marion, South Carolina [><]
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I used to run the same setup on my 14:1 compression 446" wedge on the street w/ no trouble at all. Stock clutch fan, water pump, and alternator w/ a Moroso underdrive crank pulley.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Moroso underdrive pulley on the street?
[Re: Hemi_Joel]
#2638130
03/28/19 03:19 PM
03/28/19 03:19 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Imho, on the street, if you have enough motor, the power freed up by a pully swap will be too insignificant to notice. If you're not blowing away the tires, your motor is too small and the pulley won't change that. Not sure where you're coming from with those comments. I haven't been worried about whether my car hooks on the street for 30+ years, since it's been that long since I street raced. My concern with using the car on public roads is purely whether the pulley change is likely to cause a charging and/or cooling problem. BTW, on any decent track where I hook up, my car is traditionally very consistent, which is why it's been a good test bed to see what helps the car's ET & MPH. The crank pulley tests Dwayne Porter ran & posted years ago showed a Moroso underdrive pulley picked up about 10 HP at peak over an OEM pulley on a 500+ HP 383 he built. If I picked up 10 HP from a pulley swap on a 650+ HP 440, it would definitely show up on the ET slip.
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Re: Moroso underdrive pulley on the street?
[Re: BradH]
#2638405
03/29/19 09:24 AM
03/29/19 09:24 AM
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Joined: Jan 2003
Posts: 21,080 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,080
Niles , Ohio
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We ran.run I still do March underdrives.My radical 440 runs under 190 all day with 22 inch rad.was stock now cheap Champion aluminum.My son ran the same with stock rad in his 62 300 and it also ran under 190 all day even in the 90s.never a problem charging or with temps.Ive run mine at least 20 years.My son een drove 40 miles to thetrack and back to race his 62.Rocky
Chrysler Firepower
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Re: Moroso underdrive pulley on the street?
[Re: therocks]
#2638446
03/29/19 12:11 PM
03/29/19 12:11 PM
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Joined: Feb 2003
Posts: 1,942 Metro Detroit
OUTLAWD
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,942
Metro Detroit
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I run the March underdrive set, no cooling issues, but at ~850 rpm idle I can sometimes overtax the charging system. even with the mini denso setup. But I've got elec fuel pump, elec fan, bottle heater...
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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