Exhaust temp issue
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Exhaust temp issue

  1. #1
    Senior Member SoldHondaBoughtHondo's Avatar
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    Default Exhaust temp issue

    I just got an infrared temperature gauge and checked the pipe temp. on a deal i am working on and #6 seems to run 50-100* hotter than all of the rest.....460 ford t/r. Intake has been off due to a set of budget hyd. rollers that had an issue with bleeding down, now has solids, it did it with 2 600's and 2 660's different dizzy, swapped plug wires, plugs, checked for vacuum leaks with carb cleaner and wd-40.
    It doesn't seem to show any difference on the plugs. The temp reading at the cylinder head (aftermarket aluminum) at the exhaust port and header flange doesn't show any difference but after 6" of pipe it is obvious.

    New o/t rewarders...On a cold start with no water it takes less than a min. run time for a major temp difference. Comp. is ok..Motor 'sounds' ok...i.e...i have a pretty good ear....one of them anyway and i don't hear anything out of the ordinary..all the other cyl are within 20*-30* and that pipe is showing more color than any of the other ones.....

    Anybody have any other ideas? Or i guess it will be a monday morning start over/recheck everything again....I keep thinking vacuum leak at the mid split on the t/r but it won't prove it with carb/clean or wd-40


    And an ignition question....Are any of the usual ignition systems sensitive to pulling a plug wire off at the plug..for like cylinder balance test? I have been working on motorcycles for a long time and it's not an issue but i do remember that it is possible to burn an HEI module and DIS ignition systems don't like it sometimes...something about a spark not having any place to go..except backwards....

    I have seen a few GM techs years ago who would poke a hole in the boot on the cap with a grounded test light and others who stick a test light up the boot to short a cylinder.....neither way seems a good idea on stuff that gets wet.....

    If i blow out an HEI module once in a while it's not an issue...More concerned about MSD stuff.....or maybe uno-lite...
    thanx
    mike
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  3. #2
    Senior Member Schiada 201's Avatar
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    Unless this is a allout racing motor skip the MSD stuff and buy a HEI unit, afforadable, etc. Maybe that port is on the lean side, jet that side more.

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    Senior Member SoldHondaBoughtHondo's Avatar
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    Quote Originally Posted by Schiada 201 View Post
    Unless this is a allout racing motor skip the MSD stuff and buy a HEI unit, afforadable, etc. Maybe that port is on the lean side, jet that side more.
    X2 for HEI for anything up to 8-10lbs of pump gas boost....my rig has an MSD only because it came with it and large cap HEI won't clear the t/r.


    The issue is customer stuff and being able sort out issues with minimal time and unnecessary labor. Being able to find an intermittent miss at idle with little more than an infrared temp. gauge and a pair of plastic plug boot pliers rather than selling cap/rotor/wires and a carb job that may or may not solve a problem goes a long way towards keeping customers happy.....

    And yes, i might try the jet deal...it has 660's with 78's and power valves and i have the carbs off of my deal right now and mine are 88's and no pv...swap one on and see what changes...
    Never used anything to measure pipe temp. before.. I have no idea how far 50-100* really is...although 240* to 300*/340* seems like a lot....even on a ford
    "A liberal paradise would be a place where everybody has
    guaranteed employment, free comprehensive healthcare, free
    education, free food, free housing, free clothing, free
    utilities, and only law enforcement has guns. And believe it or
    not, such a place does, indeed, exist: It's called prison."

    Sheriff Joe Arpaio
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    steelcomp was here
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    Quote Originally Posted by Sold honda.bought hondo View Post
    X2 for HEI for anything up to 8-10lbs of pump gas boost....my rig has an MSD only because it came with it and large cap HEI won't clear the t/r.


    The issue is customer stuff and being able sort out issues with minimal time and unnecessary labor. Being able to find an intermittent miss at idle with little more than an infrared temp. gauge and a pair of plastic plug boot pliers rather than selling cap/rotor/wires and a carb job that may or may not solve a problem goes a long way towards keeping customers happy.....

    And yes, i might try the jet deal...it has 660's with 78's and power valves and i have the carbs off of my deal right now and mine are 88's and no pv...swap one on and see what changes...
    Never used anything to measure pipe temp. before.. I have no idea how far 50-100* really is...although 240* to 300*/340* seems like a lot....even on a ford
    If it runs well and doesn't show in the plugs I wouldn't worry about it.
    If God is your co-pilot, change seats!
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    Senior Member wagspe208's Avatar
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    I don't know what you have. Seems like a blown deal? If you are only 50 to 100 difference, it is great. It takes quite a bit of tuning (well, for me wqith port nozzles AND injection) to get closer. Just passes, changes, passes.
    With carbs you don't have that capability. You can jet differently. It will change somewhat. Not like port nozzles, though.
    Run the damn thing.
    Oh, BTW... I thought my cyls were pretty close by plugs. I put on a computer. I was within about 60* looking at plugs.
    Wags

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    gn7
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    Every time one of the techs at work pulls out one of those infa reds, I shake my head, smirk, chuckle and walk away. You may be seeing a difference, but don't be so certain its 100*. Your playing with NASA technology at 1/1000 the cost. Like measuring your crank with a yardstick.
    Everything in the world effects them including reflectivity, and color. Shoot yourself in the forehead and tell me if it reads 98.6.


    I agree with Steel, I wouldn't worry that much if I saw that on a dyno using thermocouples. And you're not doing this under a load. The intake velocity in the intake at idle or just off idle is a mess. Air and fuel are jumping in and out of ports as far down as the valve, and back into the manifold again. Why do you think big azz cams sound the way they do. The fuel distribution, and the cylinder fill consistency is a mess.

    Your measuring this with a tinker toy, using a light beam, probably in direct sunlight, on differing surfaces, with no load, at low RPM. This doesn't qualify as a viable science experiment.



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    Last edited by gn7; 07-11-2011 at 12:56 PM.

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    Senior Member SoldHondaBoughtHondo's Avatar
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    Quote Originally Posted by gn7 View Post
    Every time one of the techs at work pulls out one of those infa reds, I shake my head, smirk, chuckle and walk away. You may be seeing a difference, but don't be so certain its 100*. Your playing with NASA technology at 1/1000 the cost. Like measuring your crank with a yardstick.
    Everything in the world effects them including reflectivity, and color. Shoot yourself in the forehead and tell me if it reads 98.6.

    I agree with Steel, I wouldn't worry that much if I saw that on a dyno using thermocouples. And you're not doing this under a load. The intake velocity in the intake at idle or just off idle is a mess. Air and fuel are jumping in and out of ports as far down as the valve, and back into the manifold again. Why do you think big azz cams sound the way they do. The fuel distribution, and the cylinder fill consistency is a mess.

    Your measuring this with a tinker toy, using a light beam, probably in direct sunlight, on differing surfaces, with no load, at low RPM. This doesn't qualify as a viable science experiment.
    That's exactly what i needed to know.....about as accurate and relevant
    as spittin on the pipes and watching it sizzle
    Boat seemed to run fine....fast enough for a kid who's only other boat was propelled with oars
    Thanx
    mike
    "A liberal paradise would be a place where everybody has
    guaranteed employment, free comprehensive healthcare, free
    education, free food, free housing, free clothing, free
    utilities, and only law enforcement has guns. And believe it or
    not, such a place does, indeed, exist: It's called prison."

    Sheriff Joe Arpaio
    Maricopa County Sheriff's Office

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