Timing question
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by oldhalftons
If there are no marks you HAVE to time it by ear, and if you can do it, its not going to blow up. anyone with good test taking skills and $200 can be a "professional Mechanic"
Last edited by Bear 45/70; Oct 3, 2005 at 01:33 PM.
Senior User
Joined: Mar 2004
Posts: 274
Likes: 0
From: MI
Could be high speed detonation poping/cracking at high RPM. More back pressue no thanks have never found much use for it in 45 years of engine building. Honda with a 4 inch tip is just a realy nasty noise (like an injured amimal that needs put down) and most likely decreases power. As the exhaust pipe increases in length the exhaust gases become cooler less expansion and speed decreases and the pipe dia can be reduced to keep the air speed up. Simple physics. High back pressure is what will toast valves and seats backs up removal of exhaust heat is not taken away frome the cylinder. Proper amounts of back pressure can be used in place of EGR but requires hours of testing.
Post Fiend
Joined: Sep 2000
Posts: 8,238
Likes: 3
From: Oregon
Originally Posted by Bear 45/70
Having been a professional mechanic for a long time, I just used to love guys like you and Scooter. Neither one of you has a clue, of either how little you know about engines and tuning them and if it doesn't blow up how lucky you are it didn't.
Having built circle track motors and hot rods since the 80's, I primarily tune by ear and a vacuum gauge. Never blown a motor doing that yet. I can't tell you the times I've taken somebodies motor they've "timed" using a light which ran so-so and gotten it to purr by ear. A timing light is only a secondary aide in my book. Still you have your right to an opinion, even if in doing you you call them clueless thus making yourself sound biased, judgemental, petty, and uninformed.Ice, my first thought was your carb, and if you've eliminated your timing thats the next step. If it were a Holley I could walk you through it to fix those symptoms but sadly I don't touch eboks with a ten foot pole
Last edited by proeliator; Oct 3, 2005 at 01:45 PM.
Elder User
Joined: Dec 2004
Posts: 769
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From: Idaho cda postfalls
when mine back fired like that one of my lifters came apart and opened the exhuast valve up when the oil pressure built up and made it backfire but yours sounds diffrent i would try dumping rice in radiotor and driving for along time until your timing made it blow up.
Posting Guru
Joined: May 2004
Posts: 2,297
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From: Spokane WA
Originally Posted by turbo2256
Could be high speed detonation poping/cracking at high RPM. More back pressue no thanks have never found much use for it in 45 years of engine building. Honda with a 4 inch tip is just a realy nasty noise (like an injured amimal that needs put down) and most likely decreases power. As the exhaust pipe increases in length the exhaust gases become cooler less expansion and speed decreases and the pipe dia can be reduced to keep the air speed up. Simple physics. High back pressure is what will toast valves and seats backs up removal of exhaust heat is not taken away frome the cylinder. Proper amounts of back pressure can be used in place of EGR but requires hours of testing.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by proeliator
Having built circle track motors and hot rods since the 80's, I primarily tune by ear and a vacuum gauge. Never blown a motor doing that yet. I can't tell you the times I've taken somebodies motor they've "timed" using a light which ran so-so and gotten it to purr by ear. A timing light is only a secondary aide in my book. Still you have your right to an opinion, even if in doing you you call them clueless thus making yourself sound biased, judgemental, petty, and uninformed.
Post Fiend
Joined: Sep 2000
Posts: 8,238
Likes: 3
From: Oregon
You still don't get it, do you? Getting wrapped up in personel comparisons because you're threatened that someone else with decades of motor experience has a differing opinion? Shall we compare e-bicept measurements now? And whats with the octane tangent? Granted, none of the motors that went in the circle track cars ran on regular, but plenty of the motors that went in the "hot rods" could run on normal dino. So, since you infer you've set national records and championships I'm sure you can provide links to said accomplishments? Not that it really has any bearing on this discussion, I'm just curious if I need to dig out my hip waders or not.
The point is, despite having some valid points, you sound both demeaning and full of hot air when you proclaim to others "if you don't do it MY way you don't have a clue and will blow your motor". A timing light can be a valuable tool, true. However, its not the ONLY way to time a motor without blowing it up. That is, if you know what your doing. Not that I in turn am inferring anything...
The point is, despite having some valid points, you sound both demeaning and full of hot air when you proclaim to others "if you don't do it MY way you don't have a clue and will blow your motor". A timing light can be a valuable tool, true. However, its not the ONLY way to time a motor without blowing it up. That is, if you know what your doing. Not that I in turn am inferring anything...
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by proeliator
You still don't get it, do you? Getting wrapped up in personel comparisons because you're threatened that someone else with decades of motor experience has a differing opinion? Shall we compare e-bicept measurements now? And whats with the octane tangent? Granted, none of the motors that went in the circle track cars ran on regular, but plenty of the motors that went in the "hot rods" could run on normal dino. So, since you infer you've set national records and championships I'm sure you can provide links to said accomplishments? Not that it really has any bearing on this discussion, I'm just curious if I need to dig out my hip waders or not.
The point is, despite having some valid points, you sound both demeaning and full of hot air when you proclaim to others "if you don't do it MY way you don't have a clue and will blow your motor". A timing light can be a valuable tool, true. However, its not the ONLY way to time a motor without blowing it up. That is, if you know what your doing. Not that I in turn am inferring anything...
The point is, despite having some valid points, you sound both demeaning and full of hot air when you proclaim to others "if you don't do it MY way you don't have a clue and will blow your motor". A timing light can be a valuable tool, true. However, its not the ONLY way to time a motor without blowing it up. That is, if you know what your doing. Not that I in turn am inferring anything...
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Post Fiend
Joined: Sep 2000
Posts: 8,238
Likes: 3
From: Oregon
Originally Posted by Bear 45/70
I've been alive along time
Originally Posted by Bear 45/70
I don't care if you F**k up your motor...Sounds to me like you turkeys...
So uh....does this mean no links to championship record breakings will be forthcoming
Laughing Gas
Joined: Jun 2005
Posts: 1,002
Likes: 0
From: San Angelo TX
Kev, I agree about the carb tuning. You can try messing with the jetting and see if that helps. Also, are you sure all of your internals are good? Something may have come from the factory a little messed up or someone may have put the wrong jets in it. It could be something simple like that(hopefully). Just chock it up to human error, before I get flammed for saying someone that has been building carbs for many years can mess up once. That, of course, after figure out your timing. Also, did you check your fuel system for water? I know that may not cause it, but I used to work on motorcycles and if they got a little water in their system, they would run like crap. Not trying to call you dumb or anything, but the most over-looked solution to a problem is the simple solution! Keep us posted on what you find!!
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by proeliator
Thats becoming very clear. I'll refrain from any Ensure, Depends, or senile dementia jokes however, since swearing and personal attacks such as this:
are not appreciated by admin. Besides, they make one sound petty and childish. Take a deep breath and calm down. If you read my post carefully I said that, in my book, a timing light was a secondary aide, rather than primary. Not that you should disregard that particular tool all together. Is that clear? And look, I made my point with saying anybody was clueless!
So uh....does this mean no links to championship record breakings will be forthcoming
are not appreciated by admin. Besides, they make one sound petty and childish. Take a deep breath and calm down. If you read my post carefully I said that, in my book, a timing light was a secondary aide, rather than primary. Not that you should disregard that particular tool all together. Is that clear? And look, I made my point with saying anybody was clueless!
So uh....does this mean no links to championship record breakings will be forthcoming
Post Fiend
Joined: Sep 2000
Posts: 8,238
Likes: 3
From: Oregon
Originally Posted by Bear 45/70
Who died and made you God on here?
Originally Posted by Bear 45/70
I've done the ear thing many times on fresh engines on start up.
Last edited by proeliator; Oct 3, 2005 at 11:37 PM.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Originally Posted by ivanribic
And they didn't blow up? Sounds a little irresponsible to me.Originally Posted by Bear 45/70 I've done the ear thing many times on fresh engines on start up. Do I trust it for final timing, he!! no, as it is irresponsible if it is someone else motor.