Glowing headers
Drifting
Joined: Aug 2005
Posts: 1,443
Likes: 65
From: Wauconda IL
I doubt that it would be carbon build-up with the short run time you've had on this engine so far.
Thread Starter
Instructor
Joined: Jun 2012
Posts: 212
Likes: 0
I have had the low vac since I had it and tried to sort the glowing header.
But the needle shake seems to have happened since I put the reverse flows on and rejected it
Melting Slicks
Joined: May 2006
Posts: 3,303
Likes: 14
From: Lynn MA
I do not think this is related to your issue, however it would help make it run better, help with mixture and only takes about a half hour to do typically.
I do think your issue is cam/ignition/valve timing related. Do a search and you can find articles with pictures regarding the transfer slots.
I do think your issue is cam/ignition/valve timing related. Do a search and you can find articles with pictures regarding the transfer slots.
Race Director
Joined: Jan 2002
Posts: 11,613
Likes: 347
From: No Where USA
When the guy rebuilt the engine he may have put the cam in 4 degrees retarded or advanced.
If you don´t get rid of the problem with the adjustments you have made, you are going to have to tear it apart.
If you don´t get rid of the problem with the adjustments you have made, you are going to have to tear it apart.
Drifting
Joined: Aug 2009
Posts: 1,346
Likes: 160
From: new iberia la
Brady, pull those pipes and see if it clears up
Instructor
Joined: Feb 2013
Posts: 197
Likes: 0
Would it be worth having an engine oil analysis done? IOW, would a wiped lobe(s) be enough extra material to show up in an oil analysis? (I'm betting it would, FWIW).
Assuming Brady has not changed the oil, in this process, that is--can't remember.
Assuming Brady has not changed the oil, in this process, that is--can't remember.
Thread Starter
Instructor
Joined: Jun 2012
Posts: 212
Likes: 0
So i checked my valve lash again, and the were all ok. When i tightened down one nut it didnt seem to resist much compared to the rest of them..... would that indicate a weak spring? (they are new springs)
4* advanced
I will give it a go tomorrow if i have time
I can give that a go also, should i drain all the oil, or should the drsin plug have any metal stuck to it?
I runs ok, i can do those once i figure out the low vac and shaking needle.
I will give it a go tomorrow if i have time
I do not think this is related to your issue, however it would help make it run better, help with mixture and only takes about a half hour to do typically.
I do think your issue is cam/ignition/valve timing related. Do a search and you can find articles with pictures regarding the transfer slots.
I do think your issue is cam/ignition/valve timing related. Do a search and you can find articles with pictures regarding the transfer slots.
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Drifting
Joined: Aug 2005
Posts: 1,443
Likes: 65
From: Wauconda IL
When you adjust the valves, are you doing it with the engine running (hydraulic I assume)?
If the engine is running, do you have the vacuum gauge attached so you can see how it behaves as you're adjusting?
If the engine is running, do you have the vacuum gauge attached so you can see how it behaves as you're adjusting?
Thread Starter
Instructor
Joined: Jun 2012
Posts: 212
Likes: 0
Nothing happened to reading when i backed off 1 at a time till it was tapping (re-tightened before moving onto the next)
Team Owner
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
I think I read where the shaking vac needle started after
you jetted?
so, how about the power spring?
could it now be bouncing the rods and causing the fluctuations?
you say 10inch of vac?
might consider a different spring.
you jetted?
so, how about the power spring?
could it now be bouncing the rods and causing the fluctuations?
you say 10inch of vac?
might consider a different spring.
Thread Starter
Instructor
Joined: Jun 2012
Posts: 212
Likes: 0
I know for sure im running too rich