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EFV-8 Club Forum / General Ford Discussion / loss of power/missing at higher RPM

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Discussion Topic: loss of power/missing at higher RPM -- page: 1 2 3

ken ct.

10-01-2015 @ 2:55 PM

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I agree after all these posts he tells us hes got a 750 cmf carb on there , normal 4 barrel carb on a flathead is around 390 cmf. Trouble is his way over kill carb on there tooooooooo big. See the hot rod guys on the Hamb section. ken ct

ken ct.

10-01-2015 @ 1:58 PM

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10-01-2015 @ 12:05 PM

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What Len said....it being a "stock flathead" etc...

Never mind....

cliftford

10-01-2015 @ 12:00 PM

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I have always done compression tests with all plugs out. That's how I was taught to do it 60 years ago. You might try it and see what readings you get.

len47merc

10-01-2015 @ 11:53 AM

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Well I guess the plot thickens now that we know it is not a stock flathead and has a 4 bbl Edelbrock 750 monster carb - likely a double pumper too 'eh? Plus custom heads, intake, surely ignition, ... Retract my comment about fuel pressure being too high - have no idea what that beast requires.

Have to admit my paradigm previously had me wrapped all around this being a stock flathead so will bow out on this one tubetype. Good luck!

Steve

This message was edited by len47merc on 10-1-15 @ 1:43 PM

tubetype

10-01-2015 @ 11:07 AM

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Carb is a large 4 barrel elder block (webber) 750 cfm. according to mfg this carb needs 4-5 lbs pressure. but because you raised the question I will check it again.

BUD

tubetype

10-01-2015 @ 11:03 AM

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lets see if I can answer ken and car crazy . pressure taken with hand held tester. all plugs in except cly under test. allowed pressure TDC 4 times with starter turning engine over. cylinder tested 60 +-5 lbs on weak side and 90 +_ 5 lbs on cylinder 1-4. Elderblock heads, intake and carb. according to past owner. engine was overhauled 10 years ago. bored to 60 over. I have run this car for over a year and never a problem until this. same oil for past year and still full and clean.

BUD

tubetype

10-01-2015 @ 10:59 AM

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len47merc

10-01-2015 @ 3:33 AM

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Assuming the compression test was performed correctly (likely as it would be extraordinarily coincidental to get it 'wrong' on 4 adjacent cylinders), and the head nut torque is within spec, and no coolant is in the oil, then carcrazy hit it for me - the heads must be different.. Someone must've changed one in the past and installed the wrong one, OR - ??? - perhaps the wrong head gasket thickness was used on one side (doubtful but possible). Either one of these or the driver's side exhaust is partialy clogged by debris (heat riser baffle, if stiill there stuck closed -?)

What markings are on each head?

Doubtful a manifold leak would affect only 4 cylinders and/or affect them so consistently. Could cause a miss at rpm though.

The fuel pressure is definitely too high.

Steve

ken ct.

09-30-2015 @ 9:41 PM

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Thanks MG I was going to say that's about twice the recommended pressure. Its a wonder the carbs not pukeing it out all over the place.Way too much pressure. ken ct. Is this an electric pump or one of those "new" China made mech. pumps sold by the big box boys. Have too heavy a spring under the diaphragm causing high pressure And a diaphragm made out of recycled condoms or some other garbage and will deteriate shortly with this corn gas. ken ct.

This message was edited by ken ct. on 9-30-15 @ 9:49 PM

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