need a little help...

SStockDart · 05-15-2008, 05:32 PM

Flat Cam...

thewrench3 · 05-16-2008, 03:29 PM

Well I got the engine all apart today. The cam is ok. The intake valves are tuliped, sucked up into the intake ports. I am going to try to post a pic. Any ideas why? The old valves I had in it never did that. I ran them for two years.

SSDiv6 · 05-16-2008, 03:36 PM

Quote:

Originally Posted by thewrench3

Well I got the engine all apart today. The cam is ok. The intake valves are tuliped, sucked up into the intake ports. I am going to try to post a pic. Any ideas why? The old valves I had in it never did that. I ran them for two years.

Which brand of valves? Manley, SI, Ferrea,...????

Mark Lewis · 05-16-2008, 04:19 PM

too much timing or lean?

BillK · 05-16-2008, 07:53 PM

TW,

Something is causing the valves to get extremely hot. It could be anything in the combustion process. I have also seen it in marine engines when water gets into the cylinders through the exhaust but I doubt this would be the case here. Did you change anything during your "freshen up" that could keep the valves from dissipating heat ? Like a much narrower valve seat than you had before ? Anything else change in your combination ? Not enough timing can be just as bad as too much. Vacuum leak ?

Just thinking out loud

mtkawboy · 05-17-2008, 01:13 PM

If the valves were sinking in the head wouldnt the lash get tighter not looser?

thewrench3 · 05-17-2008, 03:24 PM

Yes the valve lash would go to zero.
After, i put new rings, bearing and gaskets thats when the problem occurred. I use a .070 wide valve seat width. But the old valves were the same way. I changed to a thinner head gasket to try and get a llittle more compression.
I had always used manley valves in the past. Never had a problem with them. These valves were a no name brand.
I am thinking that I am running to lean, the exhaust gas temperature is 1400 deg. in high gear. I run 32 degrees total timing, that seems to be the limit with my combination. It runs slower e.t and mph with more timing.

05-15-2008, 05:32 PM	#1
SStockDart VIP Member Join Date: Dec 2007 Location: Arizona, Texan forever Posts: 1,176 Likes: 879 Liked 574 Times in 212 Posts	Re: need a little help... Flat Cam...

05-16-2008, 03:29 PM	#2
thewrench3 Junior Member Join Date: Nov 2007 Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Re: need a little help... Well I got the engine all apart today. The cam is ok. The intake valves are tuliped, sucked up into the intake ports. I am going to try to post a pic. Any ideas why? The old valves I had in it never did that. I ran them for two years.

05-16-2008, 04:19 PM	#4
Mark Lewis Member Join Date: Apr 2006 Posts: 346 Likes: 63 Liked 207 Times in 44 Posts	Re: need a little help... too much timing or lean?

05-16-2008, 07:53 PM	#5
BillK Member Join Date: Nov 2005 Location: Waldorf Md Posts: 230 Likes: 12 Liked 30 Times in 17 Posts	Re: need a little help... TW, Something is causing the valves to get extremely hot. It could be anything in the combustion process. I have also seen it in marine engines when water gets into the cylinders through the exhaust but I doubt this would be the case here. Did you change anything during your "freshen up" that could keep the valves from dissipating heat ? Like a much narrower valve seat than you had before ? Anything else change in your combination ? Not enough timing can be just as bad as too much. Vacuum leak ? Just thinking out loud __________________ Bill Koustenis

05-17-2008, 01:13 PM	#6
mtkawboy Member Join Date: May 2003 Location: Billings Mt Posts: 282 Likes: 186 Liked 54 Times in 18 Posts	Re: need a little help... If the valves were sinking in the head wouldnt the lash get tighter not looser?

05-17-2008, 03:24 PM	#7
thewrench3 Junior Member Join Date: Nov 2007 Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Re: need a little help... Yes the valve lash would go to zero. After, i put new rings, bearing and gaskets thats when the problem occurred. I use a .070 wide valve seat width. But the old valves were the same way. I changed to a thinner head gasket to try and get a llittle more compression. I had always used manley valves in the past. Never had a problem with them. These valves were a no name brand. I am thinking that I am running to lean, the exhaust gas temperature is 1400 deg. in high gear. I run 32 degrees total timing, that seems to be the limit with my combination. It runs slower e.t and mph with more timing.

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