The V8 Owners Forum -

Hello i have a couple of issues with how my engine runs, as the head and block seem to get very hot, as in to hot to touch, is this to be expected?

Also the engine seems to 'breathe' quite heavily it has litttle k&n filters on the breathers and when the engine is up to temperature these both have a hazy mist coming from them.

Next and i know this isnt strictly in the right place but ill add it on here the carburetor which is a weber 38 dgas 3c sticks at a high tick over when running but when not running it goes right back to the screw stop point, it has only just started doing this since i took the dizzy off to prime the oil, could this be a problem if the timing was put back slightly differently? i will try to cure it by adding another beefier spring into the linkage in case it is just the return spring getting tired but didnt have one tonight and am confused that doesnt seem to stick when not running.

Thank you, any insight would be appreciated. Tom

dutton v8 wrote:Hello i have a couple of issues with how my engine runs, as the head and block seem to get very hot, as in to hot to touch, is this to be expected?

I reckon this is to be expected, since it's going to be 80-90 degrees C. What does the temp gauge say?

dutton v8 wrote:Also the engine seems to 'breathe' quite heavily it has litttle k&n filters on the breathers and when the engine is up to temperature these both have a hazy mist coming from them.

Mine does that too. I have rebored cylinders, new pistons and rings, but I think the ring gaps are a bit on the wide side (im sure they are supplied that way so that people can safely fit them without measuring/adjusting the gaps!). Not much you can do about it apart from keeping the oil topped up!

dutton v8 wrote:Next and i know this isnt strictly in the right place but ill add it on here the carburetor which is a weber 38 dgas 3c sticks at a high tick over when running but when not running it goes right back to the screw stop point, it has only just started doing this since i took the dizzy off to prime the oil, could this be a problem if the timing was put back slightly differently? i will try to cure it by adding another beefier spring into the linkage in case it is just the return spring getting tired but didnt have one tonight and am confused that doesnt seem to stick when not running.

Most likely you moved the timing a bit. If you advance it, the idle will usually be faster and maybe smoother, but you'll get pinking under load. A stronger return spring might be worth doing also.

Jeff

Temp guage seems to vary since i stripped the engine, and replaced the thermostat (cooled down with a 74c thermostat in, against not having a thermostat in it as it was when i bought it) but yes is hot, dont know why i thought this temperature in the heads was an issue. I suppose there is so much plastic around modern engines that you get no feel for how hot the heads are actually getting.

The idle seems to be high but only because the turning bit(probably a more tecnical term) isnt returning to the idle adjust screw when i mannualy pull it back it has a normal tick over, just picks up again when i blip the throttle. i think another spring will sort (hope) or will poor timing force the throttle to stay open?

Thanks Tom

dutton v8 wrote:Temp guage seems to vary since i stripped the engine, and replaced the thermostat (cooled down with a 74c thermostat in, against not having a thermostat in it as it was when i bought it) but yes is hot, dont know why i thought this temperature in the heads was an issue. I suppose there is so much plastic around modern engines that you get no feel for how hot the heads are actually getting.

What sort of radiator do you have? I'm guessing it's not very big if it fits in the front of a Dutton? Do you have a good fan fitted, and does it work?

dutton v8 wrote:i think another spring will sort (hope) or will poor timing force the throttle to stay open?

I'm guessing you have a holley or edelbrock carb? I had a similar problem with the throttle spring.

Of course poor timing will not physically force the throttle open (!?) but it will raise the idle speed if it's advanced.

Jeff

dutton v8 wrote: Also the engine seems to 'breathe' quite heavily it has litttle k&n filters on the breathers and when the engine is up to temperature these both have a hazy mist coming from them.

Those breathers are supposed to be 'in' breathers, as the crankcase should have a slight vacuum on it so any oil vapour goes into the air intake.....
So there shouldn't be any haze or anything coming out of them.

In fact, there should be only one, on one side, and the other rocker cover has the flame trap and connection to the inlet system.

Chris.

Carb sticking could easily be the carb is over tightened, or the base of the carb or manifold is not flat, especially as the manifold is an adaption, take the carb off and lightly run a flat file over both mating surfaces to show any high spots,
Torque ratings for D-Gas bolts are only 5-7 ft/lbs, so they aint tight.