Here's a quick video of the truck I worked on for a while. (in this video it's having a misfire problem, and the puff of smoke is oil droplets getting on the header)
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You wonder how hot turbo headers get?
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Originally posted by Muffrazr View PostWas that a burnt valve I heard? Maybe a lifter or rocker arm tapping at the end?
The misfire is from the absence of an ignition module in the megasquirt (it's triggering the coil directly off of the VR sensor)
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Originally posted by turbostang View PostNope, likely not. It's still running fine - but it has tie bar hydraulic roller lifters and is REAL noisy, even when it's right.
The misfire is from the absence of an ignition module in the megasquirt (it's triggering the coil directly off of the VR sensor)
Watching that one pipe ( cylinder 5?) gets hot first, with that hot spot showing before then makes me lean further with my assumption.
Could all of that be due to that misfire?
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Originally posted by Muffrazr View PostThere's something in the exhaust sound that has me feeling like it before the throttle is mashed, then on deceleration that valvetrain noise reminds me of how my engine sounded after I wore it out.
Watching that one pipe ( cylinder 5?) gets hot first, with that hot spot showing before then makes me lean further with my assumption.
Could all of that be due to that misfire?
Thinking back, that is most likely the header leaking on #1, there was a healty exhaust leak on 1 and 7 until I finally pulled the headers and reworked the sealing area. There's no gaskets, only RTV... quite possibly the reason the middle tubes are glowing and the others aren't. (This video is in the right timeframe, before I fixed the headers).
The misfire starts rearing it's head around 4500RPM and pretty much halts all progress right there - if you listen close, you can hear my frustration as I hold the gas longer than I should. (at this point in the day I've been there around 6 hours trying to figure this damn thing out).
To further complicate it, this engine is way too big for this turbo setup - it's a healthy 383 with a single Turbonetics T70. THAT, truthfully, will 99% likely be the problem with exhaust leaks, odd glowing header tubes etc. This truck is a show truck, never to get used to a point where the pre-turbo backpressure would be a problem. It just gets 'driven' and shown around town.
edit - if you watch close, around 13 seconds in - 1 and 7 start glowing in the bend closest to the head, presumably not so obvious because of the length of the primary.
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Originally posted by turbostang View PostThis truck is a show truck, never to get used to a point where the pre-turbo backpressure would be a problem. It just gets 'driven' and shown around town.
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Originally posted by Big A View PostI'll never understand why people spend so much money on speed parts for a show vehicle. To each their own I suppose, not that I'd necessarily whore it out at the track, but I'd want to at least be able to romp on it with piece of mind.
You could run this thing pretty damn hard before you'd hurt it with turbine backpressure problems etc.
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