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M won't lug

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bigpig41
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PostPosted: Sun Sep 08, 2019 8:14 am    Post subject: Re: M won't lug Reply to specific post Reply with quote

WFE270 : Are those compression pressures you posted on the "M won't lug update" four different tests on the same cylinder or are the all four pressures when you tested each of the four cylinders ?????
 
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bigpig41
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PostPosted: Sun Sep 08, 2019 4:32 pm    Post subject: Re: M won't lug Reply to specific post Reply with quote

CVPost-bigpig41 wrote:
(quoted from post at 17:14:00 09/08/19) WFE270 : Are those compression pressures you posted on the "M won't lug update" four different tests on the same cylinder or are the four pressures when you tested each of the four cylinders at one session ?????


because if those are the pressures of the four different cylinders at one testing session then you must answer the question why the one cylinder has so much more compression at CRANKING SPEED. I wouldn't run the engine or go pullling until you rule this scenario out ......that something has happened in the valvetrain that is causing that cylinder with the high pressure to act as if it is operating with a much shortened total duration on its intake lobe. If a cam has a shorter duration then it will have more compression pressure at cranking speed because the intake valve is effectively closing at an earlier time ABDC(after bottom dead center) on the compression stroke and so the piston moves up further after the valve is closed so the pressure is higher. So maybe you have a half wiped out intake lobe on that cylinder with pieces of it in the oil pan or a greatly bent intake push rod as you stated you ran a very greatly reduced valve lash looking for more power. Even if the valve lift were only .150 inches because of a damaged valve train, at only cranking speed the cylinder would still get completely full on the intake stroke at only cranking rpm because the piston speed is so slow. However, when the engine is running(dynamic compression) that cylinder would be very very weak even though it is still firing. It wouldn't miss but the tractor would be running on 3.2 cylinders and "would not lug"

Shouldn't the two differents threads on this same subject be combined into one by a moderator ?
 
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buickanddeere
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PostPosted: Tue Sep 10, 2019 6:26 am    Post subject: Re: M won't lug Reply to specific post Reply with quote


Too much ignition advance at low rpms?
Lean mixture ?
Over rich mixture?
Retarded cam timing .
 
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bigpig41
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PostPosted: Tue Sep 10, 2019 7:47 pm    Post subject: Re: M won't lug Reply to specific post Reply with quote

buickanddeere wrote:
(quoted from post at 15:26:15 09/10/19)
Too much ignition advance at low rpms?
Lean mixture ?
Over rich mixture?
Retarded cam timing .


Certainly is "Retarded cam timing" if everything in the valvetrain and timing gears is factory. The stock camshaft in a M,Super M,400, or 450 doesn't even take up all the tappet clearance and start to open the valve until the crank has turned 31 degrees after top dead center. Good idea thinking that advancing the timing gears one tooth because that would straighten out the late timing of the intake lobes....but problem is the exhaust lobes would then be opening way to early in the power stroke. Would sound awesome lugging on the dyno because that exhaust pressure would be much greater out the manifold but the dyno would show compromised hp and torque.
 
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