My engine temps are high...real high, Paging Jake Raby Options

[purple]

Hey Yall,

I just installed my Cylinder Head temp sensor under the plug on #3, didnt cut the wires and installed everything as per VDO specs.

I also hooked up my oil temp gauge and to my delight, the sensor actually works.

Now, the bad news...

My engine runs hot....REAL hot.

According to Jake, this thing should be severely damaged by now. At idle it'll get up to 350 on head temps pretty quick and stay there.

After driving a little it'll get to 400 and stay there, going down to 350 when sitting at a light. If i start cruising at 45mph or so, it'll get to 400 and a little beyond, i think i've seen as high as 450 on there. Just cruising in 4th gear going 45 will do this. The thing is, the engine sounds fine. I was expecting to hear wierd noises or see smoke, but it just keeps thrumming along. What's going on here?

About the engine:
hydraulic lifters.
no lower air diverter (plastic flap thingy) on passenger side
no lower engine tin on driver's side
pretty much shot seals around the engine tin
no warm air guides
stock 76 exhaust manifold to cobbled shitty motorcycle dual exhaust, 1 per cyl bank
weber progressive carb
what looks like a 009 on there (mallory and promaster are on the way)

What can I do to lower these temps? is my engine toast? (it seems to drive just fine, if a little slow)

It had run-on and was pinging on the last tank of gas (regular) but now i'm running premium and those things seem to have stopped

Help me guys, jake, what can i do? timing? too lean? what?

[Jake Raby]

Oh my god.... You have several things causing this, together they are a death sentence for the engine. It doesn't get much worse ...

My only question is WHERE did you install the CHT sensor?

After driving a little it'll get to 400 and stay there, going down to 350 when sitting at a light. If i start cruising at 45mph or so, it'll get to 400 and a little beyond, i think i've seen as high as 450 on there. Just cruising in 4th gear going 45 will do this. The thing is, the engine sounds fine. I was expecting to hear wierd noises or see smoke, but it just keeps thrumming along. What's going on here?

Whats going on? A totally fucked up configuration is whats going on! More than likely the engine will sound fine, right up to the point where it goes boom. My ears would more than lilley hear different things than yours.

About the engine:
hydraulic lifters.

Strike one.

no lower air diverter (plastic flap thingy) on passenger side

I am lost as to the part you refer to here.

no lower engine tin on driver's side

Strike two- ALL stock tin MUST BE IN PLACE!

pretty much shot seals around the engine tin

Strike 3... You are sucking in hot air off the highway and the hot underside of the engine and expecting that to cool the engine. Hotter air doesn't cool- it also kills the temperature of the air going into the engine's intake charge, making less efficiency which CREATES HEAT.

no warm air guides

What parts?? Not familiar with this term.

stock 76 exhaust manifold to cobbled shitty motorcycle dual exhaust, 1 per cyl bank

Strike 4 and the biggest yet! EXHAUST IS EVERYTHING!!!!!!! WHY the hell do people continue to do the dual exhaust bullshit with these engines? With a dual exhaust you have ZERO scavenging of the exhaust gases, thus killing efficiency and creating reversion between paired cylinders. Take that exhaust off and throw it away and do it now.

weber progressive carb

Strike 5. Take it off and throw it away too. Total piece of shit IMHO.

what looks like a 009 on there (mallory and promaster are on the way)

Wise move on the Mallory, but it does not perform miracles and coupled to that exhaust, those lifters and that carburetor you are still going to have challenges.

What can I do to lower these temps? is my engine toast? (it seems to drive just fine, if a little slow)

The first thing is tossing that header, verifying that it isn't lean and verifying that the timing isn't above 30* BDTC full advance. do a val;ve adjustment, as everything associated with those 400F+ heads has moved around- guaranteed.

It had run-on and was pinging on the last tank of gas (regular) but now i'm running premium and those things seem to have stopped

The problem is still there, the higher octane just threw a mask over it.

Help me guys, jake, what can i do? timing? too lean? what?

Toss the progressive, buy dual 40mm Webers.
Install the Mallory
Get a real header

Damage has been done, detonation that is loud enough to be audible damages combustion chambers, rod brearings and weakens pistons. The higher exhaust gas temps created by the shitty exhaust has soaked into the exhaust valves and weakened them as well, more than likely.

This engine is cursed with every bad thing you can throw at it. Go play the lotery right now because you are one lucky guy to not have scattered parts all over the ground already. Hitting 450F is serious business.

Who the hell installed all that crap? Hope it wasn't you. He needs his ass beat. (IMG:style_emoticons/default/chair.gif)


(can I be more blunt?)

This post has been edited by Jake Raby: Sep 13 2007, 05:27 PM