Search found 68 matches: +220 +Holley +500 +jets

Searched query: +220 +holley +500 +jets

by TDezso
Sat Mar 18, 2017 10:52 pm
Forum: Aircraft Power Only
Topic: 220 bogs and loses power at wide open throttle.
Replies: 26
Views: 1549

220 bogs and loses power at wide open throttle.

Having a problem with my motor bogging and losing power at wot. It's a Holley 500 with 76 jets. It also seems to run rough around 2000rpm.


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by John Fenner
Fri Sep 09, 2016 11:02 pm
Forum: Aircraft Power Only
Topic: my 220 gpu conversion
Replies: 12
Views: 1644

Re: my 220 gpu conversion

jeepinocala1111 wrote:A holley 500 2 barrel is the carb you should be running a 4 barrel will not work as good.

Exactly, should have #75/6 jets, power valve plug off, and 22*/23* of timing.
by John Fenner
Tue Aug 09, 2016 10:49 pm
Forum: Aircraft Power Only
Topic: Tuning Holley 500 for rebuilt gpu 220
Replies: 16
Views: 1186

Re: Tuning Holley 500 for rebuilt gpu 220

... running same setup on the 1995 , 220/470 conversion on the avatar in my page, it has a 500 Holley, annular discharge boosters I took ... 85 HO Mustang carb, it actually has #73 jets due to the hard pull and atomization, ...
by glades cat
Tue Aug 09, 2016 12:53 pm
Forum: Aircraft Power Only
Topic: Tuning Holley 500 for rebuilt gpu 220
Replies: 16
Views: 1186

Re: Tuning Holley 500 for rebuilt gpu 220

... matter. X2….the thing I would add when not using the power valve on a Holley is to increase the jet size a couple of numbers. This is to make up ... power valve fuel delivery system is like having a second set of jets, which opens when the manifold vacuum reaches the power valve number. ...
by dshaw94
Tue Aug 09, 2016 10:31 am
Forum: Aircraft Power Only
Topic: Tuning Holley 500 for rebuilt gpu 220
Replies: 16
Views: 1186

Re: Tuning Holley 500 for rebuilt gpu 220

John Fenner wrote:74# jets and a power valve block off plug is my choice, be sure the float balance spring is installed, I like to preload them a bit more than stock, 100LL has less specific gravity than car gas, will tend to flood without the spring installed


Why wouldn't you want to run a power enrichment circuit?
by John Fenner
Tue Aug 09, 2016 9:02 am
Forum: Aircraft Power Only
Topic: Tuning Holley 500 for rebuilt gpu 220
Replies: 16
Views: 1186

Re: Tuning Holley 500 for rebuilt gpu 220

74# jets and a power valve block off plug is my choice, be sure the float balance spring is installed, I like to preload them a bit more than stock, 100LL has less specific gravity than car gas, will tend to flood without the spring installed
by John Fenner
Tue Feb 23, 2016 4:56 pm
Forum: Aircraft Power Only
Topic: 220 carb holley 500
Replies: 14
Views: 1222

Re: 220 carb holley 500

My 220 conversion has a modified 500, I put annular discharge boosters in it from an 80s Mustang 5.0ho carb with 75 jets and a power valve block off plug. A stock PE150 will run fine with an out of the box unit but tuning is recommended as Glades Cat suggests.
by jeepinocala1111
Mon Feb 22, 2016 6:31 pm
Forum: Aircraft Power Only
Topic: 220 carb holley 500
Replies: 14
Views: 1222

Re: 220 carb holley 500

I had a Holley 500 on my GPU and it ran well. The only thing you need to do is install some 74 size jets, a 10.5 power valve and get a cyl temp kit and gauge to keep an eye ...
by glades cat
Sun Feb 21, 2016 3:20 pm
Forum: Aircraft Power Only
Topic: 220 carb holley 500
Replies: 14
Views: 1222

Re: 220 carb holley 500

I had a Holley 500 on my GPU and it ran well. The only thing you need to do is install some 74 size jets, a 10.5 power valve and get a cyl temp kit and gauge to keep an eye on things. I wouldn't get anything "race ready". By new and do the simple jet & power valve mods.
by GMAC 76
Thu Oct 29, 2015 3:40 pm
Forum: Aircraft Power Only
Topic: NEED A LITTLE GPU HELP
Replies: 26
Views: 1611

NEED A LITTLE GPU HELP

working on a 220 gpu...dual mag, mechanical fuel pump, ... are in sync.....new out of the box 500 holley carb....engine starts and idles perfect ... familiar with the automotive setups ie. jets power valves squriters etc. ....any ...
by fletchster76
Sat Nov 15, 2014 7:15 pm
Forum: Aircraft Power Only
Topic: Help, finally started 520 conversion, issues
Replies: 42
Views: 6598

Help, finally started 520 conversion, issues

I blew up my 220 a few months ago so decided to build ... sputtering then dies. Rev it up to 1500 rpms, runs good but after a little ... 2750. I've played with timing and jets buts can't find issue. Any thoughts ... I had on the gpu and using the same holley 500. Lastly, when I adjust the ...
by GMAC 76
Thu Sep 18, 2014 12:13 pm
Forum: Aircraft Power Only
Topic: 220 GPU , Holley 500 Main Jet size.
Replies: 4
Views: 967

Re: 220 GPU , Holley 500 Main Jet size.

... may help ya out. http://www.southernairboat.com/phpBB3/viewtopic.php?f=47&t=50427 yea I remember that was my post and we ended up with #74 jets everything else remained as it was out of the box and the plugs showed a nice clean burn top and bottom with the 74's......maybe a tad fat but ...
by jopete
Thu Sep 18, 2014 8:58 am
Forum: Aircraft Power Only
Topic: 220 GPU , Holley 500 Main Jet size.
Replies: 4
Views: 967

220 GPU , Holley 500 Main Jet size.

... tear the carb abart and see what size the main jets are and rejet accordingly. the boat starts ... what size main jet they are running in their holley 500 with a stock GPU to give me a referance point? i have ...
by John Fenner
Wed Jul 02, 2014 10:27 am
Forum: Aircraft Power Only
Topic: Updraft or downdraft on 220 conv?
Replies: 13
Views: 894

Re: Updraft or downdraft on 220 conv?

I would run the Holley, you can tune it better than an updraft plus your mileage will be better, my conversion has 470 jugs, 8.6:1 and a 500 Holley with 73 jets, it runs strong and burns very little fuel.
by hillbilly540
Tue May 06, 2014 6:46 am
Forum: Aircraft Power Only
Topic: 220 loses power after 3 seconds
Replies: 12
Views: 1221

Re: 220 loses power after 3 seconds

... problem. ..we had the same problem with our holley 500 and we put the 10.5 high flow power valve in it and we are running the 74 main jets and now it will hold the wot rpms and not fall off now....we ...
by John Fenner
Sun Apr 20, 2014 9:18 am
Forum: Aircraft Power Only
Topic: 220 continental hesitation on holley 500
Replies: 10
Views: 634

Re: 220 continental hesitation on holley 500

Also, check the pilot jets for corrosion, they are the small orifice brass jets pressed into the metering plate on either side of the power valve. A good ream with a torch tip cleaner helps.
by John Fenner
Sun Apr 20, 2014 9:14 am
Forum: Aircraft Power Only
Topic: 220 continental hesitation on holley 500
Replies: 10
Views: 634

Re: 220 continental hesitation on holley 500

X2 on the no play in the accelerator pump arm. No need for bigger jets, 74 is perfect for these engines, what is the timing set at?
by chuckitt@earthlink.net
Sun Apr 20, 2014 8:28 am
Forum: Aircraft Power Only
Topic: 220 continental hesitation on holley 500
Replies: 10
Views: 634

Re: 220 continental hesitation on holley 500

Install a # 37 squirter or drill it out to .037, adjust the pump arm where you have no free play, reinstall the # 77 main Jets, leave the 10.5 power valve installed. ( if it blows black smoke out the exhaust, do a top end job ) Adjust the metering plate idle screws to 1 turn out. You ...
by quickboats
Sat Apr 19, 2014 2:30 pm
Forum: Aircraft Power Only
Topic: 220 continental hesitation on holley 500
Replies: 10
Views: 634

Re: 220 continental hesitation on holley 500

look the holley carb cam stock with a 5.0 50cc pv an i took the power valve out an put a 10.5 in cause these forms had a post on this carb they said to put in a 8.0 or a 10.5 an .77 jets an i put 10.5 and 77 jets an now i have the 10.5 pv an 74 jets an still have the same ...
by quickboats
Sat Apr 19, 2014 12:34 pm
Forum: Aircraft Power Only
Topic: 220 continental hesitation on holley 500
Replies: 10
Views: 634

Re: 220 continental hesitation on holley 500

i had 77 jets in it before an it did the same thing a friend told me he bought a holley 500 an changed his PV to a 10.5 an i dont know how many cc it puts out
by quickboats
Sat Apr 19, 2014 10:41 am
Forum: Aircraft Power Only
Topic: 220 continental hesitation on holley 500
Replies: 10
Views: 634

220 continental hesitation on holley 500

i have a 220 with a holley 500 the jets are 74 with a power valve 10.5 an a nozzel is a 28. when i get on the throttle i have a 4 second hesitation i need help i dont want the hesitation i would like it to jump right up please help thank u an happy easter ever one
by BR549
Tue Feb 11, 2014 10:38 am
Forum: Aircraft Power Only
Topic: 220 gpu
Replies: 10
Views: 756

Re: 220 gpu

Hillbilly,
I don't how much psi's, that's something I'm going to find out thou. But the fuel pump pulls it from the tank thru a racor fuel filter, and pumps it to a holley 500 with stock jets .073 .
by midnight rider
Tue Jan 15, 2013 2:35 pm
Forum: Aircraft Power Only
Topic: what is the best carbuerator to use on a 220 conversion
Replies: 7
Views: 365

Re: what is the best carbuerator to use on a 220 conversion

John what size jets do you recommend. Also I called Holley today and they said 350 Cfm was better for 470 cu in with rpm redline of 3000. Said the 4412 500 Cfm was intended for a motor turning up to 5000. I see everyone ...
by midnight rider
Tue Jan 15, 2013 7:24 am
Forum: Aircraft Power Only
Topic: 220 jet sizes
Replies: 14
Views: 651

220 jet sizes

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.
by PeaRiverOpossum
Mon Dec 10, 2012 3:37 pm
Forum: Aircraft Power Only
Topic: JETTING A 500 HOLLEY GPU
Replies: 7
Views: 775

Re: JETTING A 500 HOLLEY GPU

John Fenner wrote:They typically come with 73 jets, get a power valve plug and block it off, you dont need it, I have 73s in my 220/470 convo.

John can you please give us a brief description on what the power valve actually does or doesn't do in this case?

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