Search found 1145 matches

by GMAC 76
Sat Feb 16, 2019 9:27 pm
Forum: Aircraft Power Only
Topic: Carb rebuild ????
Replies: 22
Views: 1195

Re: Carb rebuild ????

if the carb was full of fuel when it was shut down and has set for that long most of the fuel circuits are most likely plugged with residue from the fuel and imo a full overhaul is most likely in order but taking it apart will tell ya what needs to be done ....it is the best way to be sure....if the...
by GMAC 76
Wed Feb 13, 2019 9:40 am
Forum: Aircraft Power Only
Topic: 0290 GPU Carberator
Replies: 1
Views: 274

Re: 0290 GPU Carberator

I had an old 290 gpu way back in the day and the carb of choice then was a 1 barrel rochester off an old 6cyl chevy pickup 235 engine....think they called it a tea pot carb........ NAPA sold them rebuilt by a company called Cherokee Rebuilds..... there are used and rebuilt ones for sale on e-bay
by GMAC 76
Tue Feb 12, 2019 9:39 pm
Forum: Aircraft Power Only
Topic: Tuning a Lean Running O-540 & 6AA / M5-4 Carbs
Replies: 86
Views: 4981

Re: Tuning a Lean Running O-540 & 6AA / M5-4 Carbs

holy cow!!!!!......NOW I know why I still use the old magneto ignition....this electronic ign is way over my head...LOL
by GMAC 76
Tue Feb 12, 2019 10:26 am
Forum: Aircraft Power Only
Topic: Tuning a Lean Running O-540 & 6AA / M5-4 Carbs
Replies: 86
Views: 4981

Re: Tuning a Lean Running O-540 & 6AA / M5-4 Carbs

John Fenner wrote:Agree on plug color as well.
I also agree on the plug color plus is it not hard to believe that the engine can run at those temps 450 and 550+ for that many hours without any issues or failures ....just don't seem mechanically possible it can run that hot and live
by GMAC 76
Tue Feb 12, 2019 10:20 am
Forum: Aircraft Power Only
Topic: Tuning a Lean Running O-540 & 6AA / M5-4 Carbs
Replies: 86
Views: 4981

Re: Tuning a Lean Running O-540 & 6AA / M5-4 Carbs

Tell me about the "copper gasket" thing. What is that supposed to do? BTW, after looking at your O2 sensor pics, I am not sure if your readings are accurate. My research said the sensor needs to be 18 -24 inches from the cylinders. That information was not for an aircraft engine, but for the system...
by GMAC 76
Thu Feb 07, 2019 8:17 am
Forum: Aircraft Power Only
Topic: Electric Fuel Pump recommendation
Replies: 8
Views: 536

Re: Electric Fuel Pump recommendation

Facet Gold Flow...3-5 psi.....36gph
by GMAC 76
Wed Feb 06, 2019 10:49 am
Forum: Aircraft Power Only
Topic: 520 Continental rebuild
Replies: 127
Views: 8602

Re: 520 Continental rebuild

my neighbor here at the fish camp has a 520 gpu conversion with the holley setup and it is really sweet......fuel consumption is real good and acceleration is terrific...actually seems like a better application for the log intake system to me
by GMAC 76
Wed Feb 06, 2019 10:05 am
Forum: Aircraft Power Only
Topic: 520 Continental rebuild
Replies: 127
Views: 8602

Re: 520 Continental rebuild

if in fact your are 100% sure the engine is running too lean and needs more fuel then the only way to provide more fuel on the 4-5 carb would be to enlarge the main nozzle/jet....but like John said it is a time consuming job till ya get the results ya want cause ya need to drill in such small increm...
by GMAC 76
Wed Feb 06, 2019 9:04 am
Forum: Aircraft Power Only
Topic: 520 Continental rebuild
Replies: 127
Views: 8602

Re: 520 Continental rebuild

I do not have one at this moment but I have several carb cores coming from Airzona and I believe there is a 6AA in that bunch maybe 2....
by GMAC 76
Tue Feb 05, 2019 9:23 am
Forum: Aircraft Power Only
Topic: 520 Continental rebuild
Replies: 127
Views: 8602

Re: 520 Continental rebuild

I would suggest an MA 6, use the aneroid to adjust fuel mixture by backing it out a 1/4 turn till plugs tan up. Or have a manifold built to hold a Holley 500 with #78 jets. Also, main jet in the 4404 can be drilled out, it just takes many R&R of the bowl to get it fatter, I would ream the pilot jet...
by GMAC 76
Mon Feb 04, 2019 9:35 pm
Forum: Aircraft Power Only
Topic: 520 Continental rebuild
Replies: 127
Views: 8602

Re: 520 Continental rebuild

The carb was an MA-4-5.......10-4404....OEM 0-540 260HP engine....there is no bigger stock jet than the 47-779 that is in that carburetor that I am aware of.....it is essential that the l/r lever be in the full rich position at all times...and an adjustment of the economizer may help...I seem to hav...
by GMAC 76
Mon Feb 04, 2019 11:24 am
Forum: Aircraft Power Only
Topic: Impulse coupling
Replies: 4
Views: 330

Re: Impulse coupling

ok im headed out to the shop....I know I have the housing and the spring....will check the numbers and see if I have the cam and what degree it is....if I got it all I can ship it to ya today....I will let ya know shortly.........................yep got exactly what ya need with a 45 degree riveted ...
by GMAC 76
Sun Feb 03, 2019 9:12 pm
Forum: Aircraft Power Only
Topic: Impulse coupling
Replies: 4
Views: 330

Re: Impulse coupling

do ya need the whole impulse assembly? (housing, spring and cam)........what degree lag do ya want on the cam?
by GMAC 76
Mon Jan 21, 2019 9:45 am
Forum: Aircraft Power Only
Topic: This is an O290 GPU , yes?
Replies: 4
Views: 493

Re: This is an O290 GPU , yes?

GMAC, mine was a question. Not as experienced as many, I’m searching for the proper answer. I’d love affirmation that my assertion was accurate. But if my guess is incorrect, correction is greatly appreciated. oh I totally understand your questioning I was just curious as to if there was something ...
by GMAC 76
Sun Jan 20, 2019 8:24 pm
Forum: Aircraft Power Only
Topic: This is an O290 GPU , yes?
Replies: 4
Views: 493

Re: This is an O290 GPU , yes?

what exactly on the engine makes ya think it is a GPU and not an aircraft flight engine?
by GMAC 76
Sun Jan 13, 2019 3:49 pm
Forum: Aircraft Power Only
Topic: Who works on mags around groveland fl need Bendix 20 series worked on
Replies: 13
Views: 888

Re: Who works on mags around groveland fl need Bendix 20 series worked on

complete overhaul using new parts, bench test, mounting gaskets and shipping is $185 per mag and you get all your old parts back....the only additional charge would be if the coil needs replaced but that seldom happens if ya have the bendix red hi output coils
by GMAC 76
Sun Jan 13, 2019 2:11 pm
Forum: Aircraft Power Only
Topic: Who works on mags around groveland fl need Bendix 20 series worked on
Replies: 13
Views: 888

Re: Who works on mags around groveland fl need Bendix 20 series worked on

Underpowered83 wrote:Could I possibly ship them to you or do you do such?
hell ya....do that all the time.....turnaround time right now is about 5-6 days as I am swamped with mag and carb work right now but if ya want to ship em to me ......greg mccloud.....4 Henderson rd.....lake placid fl 33852
by GMAC 76
Sat Jan 12, 2019 3:40 pm
Forum: Aircraft Power Only
Topic: Who works on mags around groveland fl need Bendix 20 series worked on
Replies: 13
Views: 888

Re: Who works on mags around groveland fl need Bendix 20 series worked on

I build and rebuild Bendix mags but maybe a little to far away from ya in lake placid.....
by GMAC 76
Fri Dec 28, 2018 10:37 am
Forum: Aircraft Power Only
Topic: carburetor
Replies: 18
Views: 1428

Re: carburetor

Billykid wrote:what is max fuel pressure for M4-5
3-5 psi
by GMAC 76
Sun Dec 23, 2018 7:15 pm
Forum: Airboat Talk
Topic: Lookin For 18mm spark plug helicoil
Replies: 4
Views: 413

Re: Lookin For 18mm spark plug helicoil

I got the coils if ya want me to send ya a couple for Bobs install tool
by GMAC 76
Mon Nov 26, 2018 11:10 am
Forum: Aircraft Power Only
Topic: Timing pros an cons
Replies: 14
Views: 1514

Re: Timing pros an cons

try 20 degrees....might not affect the low end push but maybe help the top end
by GMAC 76
Fri Nov 23, 2018 9:41 am
Forum: Airboat Tech
Topic: Line X on full deck
Replies: 7
Views: 838

Re: Line X on full deck

I know it is not quite the same but a buddy had the inside of his 15' glass hull Line-X in light gray...he loved the finished product but does have some concerens now about the added weight which he said is noticeable
by GMAC 76
Tue Nov 20, 2018 8:47 pm
Forum: Aircraft Power Only
Topic: Lycoming 320 starting procedure
Replies: 27
Views: 2959

Re: Lycoming 320 starting procedure

FACET GOLD FLOW....3-5 PSI....34 GPH
by GMAC 76
Mon Nov 19, 2018 9:58 pm
Forum: Aircraft Power Only
Topic: 220 won't idle ?
Replies: 19
Views: 1731

Re: 220 won't idle ?

jopete wrote:
the idle screws fit loose, I bet when I change them out and the seats it will fix it, at least that's what I am thinking.
those little seals are what keeps the screws in place and seals the needle when ya find that sweet spot....I think your on the right track man....good luck
by GMAC 76
Mon Nov 19, 2018 9:03 pm
Forum: Aircraft Power Only
Topic: 220 won't idle ?
Replies: 19
Views: 1731

Re: 220 won't idle ?

check to make sure that the idle screws still have the little cork seal around them...if they are gone it can make a constant good idle hard to set....the renew kit will have them in it ....just a thought

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