220 jet sizes

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midnight rider
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220 jet sizes

Postby midnight rider » Tue Jan 15, 2013 7:24 am

What size jets are most running in your Holley 500. For a 220 with flat tops h290 cam and dual impulse mags. Feel free to comment on Timing also.

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Re: 220 jet sizes

Postby midnight rider » Tue Jan 15, 2013 8:51 am

Forgot to mention it has p10's

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Re: 220 jet sizes

Postby PeaRiverOpossum » Tue Jan 15, 2013 8:55 am

I just went from 75s to 72s this week on my single mag if that helps any. Too early to see a difference. Havent pulled the plugs after my one ride yet.

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Re: 220 jet sizes

Postby midnight rider » Tue Jan 15, 2013 8:58 am

It has 73's now and seems to runnin real lean. Are you running a two barrel 500?

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JAMES
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Re: 220 jet sizes

Postby JAMES » Tue Jan 15, 2013 10:34 am

76's with 28 deg timing will wake her up .. with plugs gapped around 18-21 jmo
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Re: 220 jet sizes

Postby midnight rider » Tue Jan 15, 2013 11:13 am

That's what I was thinking till I called Holley. They said a 500 Cfm -4412 was the worst carb to use. Said it should have a 7448 which is 350 cfms.

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Re: 220 jet sizes

Postby JAMES » Tue Jan 15, 2013 11:34 am

midnight rider wrote:That's what I was thinking till I called Holley. They said a 500 Cfm -4412 was the worst carb to use. Said it should have a 7448 which is 350 cfms.

THATS POSSIBLE BUT HOLLEY DONT BUILD OR RUN AIRBOATS AND THEY BY FAR DONT NO WHAT WILL AND WONT WORK ON A AC /GPU MOTOR JMO 99% OF THE 500 CFMS ARE 4412 .. GOOD LUCK THOUGH
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Re: 220 jet sizes

Postby John Fenner » Tue Jan 15, 2013 12:05 pm

What cubic inch was discussed during this conversation with Holley?
I never finish anyth,,,.

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Re: 220 jet sizes

Postby JAMES » Tue Jan 15, 2013 12:55 pm

John Fenner wrote:What cubic inch was discussed during this conversation with Holley?

ALOT OF FOLKS DONT RELIZE HOW MANY CID'S THEM PE150/220 REALLY ARE :wink:
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Re: 220 jet sizes

Postby PeaRiverOpossum » Tue Jan 15, 2013 1:10 pm

midnight rider wrote:It has 73's now and seems to runnin real lean. Are you running a two barrel 500?

If it is running lean on 73's I would check for intake leaks. And I would not talk to Holley about GPU/AC engines. I am (as well as just about every other GPU I have seen unless running original Zenieth) running the two barrel 500. How are you checking lean/rich condition? Also, what plugs/gap are you running?

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Re: 220 jet sizes

Postby midnight rider » Tue Jan 15, 2013 2:39 pm

Gonna check gap this afternoon. They are ac delco c87's.
James we discussed 470 cubes.

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Re: 220 jet sizes

Postby PeaRiverOpossum » Tue Jan 15, 2013 2:50 pm

Mine are gapped around .030 and running NGK AB6

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Re: 220 jet sizes

Postby midnight rider » Tue Jan 15, 2013 3:43 pm

.030 is a lot. Lots of space to arc across. Puts extra strain on the coil.

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Re: 220 jet sizes

Postby JAMES » Tue Jan 15, 2013 6:34 pm

midnight rider wrote:.030 is a lot. Lots of space to arc across. Puts extra strain on the coil.

check each plug buy new plugs if it burns oil bad gap big if not gap small !! 18-21 no burn 25-+ burn oil jmo
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Re: 220 jet sizes

Postby PeaRiverOpossum » Tue Jan 15, 2013 11:55 pm

I'm glad this came up again. After talking to some folks I'm changing my gap to .020 or so and going for a ride in the a.m. will report back tomorrow pm

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