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07-30-2015, 02:05 PM | #21 |
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Re: Engine failure - high speed running
Sounds like there a number of causes for this failure. From the looks of that rod I'd be concerned about the quality of the rebuild. Was the nut not tightened and vibrated off? Did someone strip the threads and just leave it that way? Pay attention to the other nuts and bolts as you disassemble. Try tightening them first to see if any are loose. 3,000 RPM is not too much for the stock oiling system.
Could you clarify what your coolant temps normally are and the max. is that you have seen? I noticed one place said up to 300 and another said 220. If it's running over 220, that's too high. Do you know what the piston to cylinder wall clearance was? You won't get an accurate reading now that the damage is done. |
07-30-2015, 02:14 PM | #22 |
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Re: Engine failure - high speed running
Too Hot. The last couple of times you drove it she should have smoked,look how wet the port looks. Piston down in hole has silver looking specks on top...not good. a Lot of carbon build up for 1000 miles. Looks like there was alot of blow by also.
By chance...you dident have drain holes drilled into your oil tray? Wick |
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07-30-2015, 02:25 PM | #23 | |
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Re: Engine failure - high speed running
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07-30-2015, 02:26 PM | #24 |
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Re: Engine failure - high speed running
Sorry, it was too early here for me to try to be intelligent. My piston clearance is .005, not .050. My ring gap is .020 +or- .001. Sorry for posting bad info.
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07-30-2015, 06:07 PM | #25 |
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Re: Engine failure - high speed running
Chalk up another victory for Evans Waterless coolant! Instead of running at a normal temp and inconveniencing you with a mandatory stop if you ever boil over, the stuff always runs very hot due to its low specific heat and because it doesn't boil it let you drive directly to total engine destruction. I'm running right out to buy some!
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07-30-2015, 06:17 PM | #26 |
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Re: Engine failure - high speed running
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Whats the spark plug look like that was in the #1 hole (the one with the piston top damage) Phil |
07-30-2015, 06:45 PM | #27 |
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Re: Engine failure - high speed running
You definitely had some detonation going on in #1 cylinder as witnessed by damage of the outer edges of the piston. Can't see the other pistons but #2 looks like it might have been detonating also.
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07-30-2015, 08:16 PM | #28 |
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Re: Engine failure - high speed running
Detonation and too high of coolant temps is what I see causing the damage.
Save that piston.........it would make a good "Hard Luck" trophy. |
07-30-2015, 08:51 PM | #29 |
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Re: Engine failure - high speed running
I am not so sure that No 1 had much detonation, it looks to me the top ring land broke away. Severe Detonation looks different. But it is too late now.
Even the absolute best parts can fail, this rod just needs a fork stuck in it. These motors can handle quite a bit of abuse if properly clearance and lubricated. They do like to expose themselves when not happy though........
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07-30-2015, 08:54 PM | #30 | |
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Re: Engine failure - high speed running
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07-31-2015, 02:51 AM | #31 |
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Re: Engine failure - high speed running
Thanks for everyone's posts. I will attempt to answer the responses.
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07-31-2015, 02:57 AM | #32 | |
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Re: Engine failure - high speed running
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The rings in number 2 piston were only a little tight and number 3 piston was OK. I checked the piston gap and it is .008" front and back and .005" on both sides. All the other big ends and main engine Babbitt bearings are OK. Last edited by ppower; 07-31-2015 at 04:20 AM. |
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07-31-2015, 03:06 AM | #33 | |
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Re: Engine failure - high speed running
Quote:
The engine normally runs at about 220 degrees. Once after a fast run I checked the coolant temperature with a digital thermometer and it was 285degrees. Piston clearance are detailed in my previous post |
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07-31-2015, 03:09 AM | #34 | |
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Re: Engine failure - high speed running
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07-31-2015, 03:12 AM | #35 |
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Re: Engine failure - high speed running
#17 second picture, what is the white stuff in the coolant chamber?
If you built a racing engine, the first thing I'd start with is a crankshaft with counterweights. Your rings have enough clearance, but what's the skirt clearance, if 2 and 3 aren't too damaged to get an accurate measurement? |
07-31-2015, 03:47 AM | #36 | |
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Re: Engine failure - high speed running
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07-31-2015, 04:17 AM | #37 | |
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Re: Engine failure - high speed running
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Here is a photo of all the plugs, unfortunately I cannot remember which was in number 1 cylinder. What ignition advance do you think I should have been using? |
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07-31-2015, 05:57 AM | #38 | |
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Re: Engine failure - high speed running
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I am not looking for a racing engine. The Ford engine, was a quick cheap fix when the original engine (one of only five remaining) boke its centre bearing. I now love the torque, but don't want more revs. The piston crown clearances are listed above in #33. The skirt clearances are .005" front and rear and .002" on both sides. |
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07-31-2015, 06:58 AM | #39 |
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Re: Engine failure - high speed running
The parts and clearances in your engine is only a distraction. Your basic mistake is assuming that the Evans coolant will compensate for a radiator that is too small. The Evans transfers less heat, not more. Thier site says, " Vehicles running under normal operating conditions, should show no change or a slight increase in temperature." As others have said, you need more cooling capacity to keep the engine at it's proper operating temperature. Ron W
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07-31-2015, 08:27 AM | #40 | |
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Re: Engine failure - high speed running
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