Have you had this problem before?

alstgg180 · 10-02-2010, 08:26 AM

Has anyone had a problem with the oil in the engine smelling like petrol?

New oil and when ya pull the dip stick out the oil is a little black but has a strong smell of petrol.

TUF 253 · 10-02-2010, 09:15 AM

that usually happens when your running the engine too rich and washing the bores, it can also be a leaky carby/fuel injector as when you turn the engine off it can leak down past an open valve and past the piston rings, gotta be careful mate cause fuel will destroy you oil pretty quickly(will loose its lubricating performance) or it could just be blow-by on ya piston rings, easy to tell just get a comp tester to check that one mate

alstgg180 · 10-02-2010, 09:37 AM

Fuel pressure is set at 6 psi.
Idle's at 800rpm
The carbie has just been rebuilded.
The manifold is ported, polished same to the head.
The head has only done not even 500km since rebuild.
The block has only done 16,000km.

nobraks · 10-02-2010, 10:00 AM

Considering that 6psi can support 500hp i'd be looking at lowering that for a start and also fuel maybe leaking in after the engine has switched off does it have a fuel solenoid on it to stop such an event from happening .

alstgg180 · 10-02-2010, 10:19 AM

Quote:

Originally Posted by nobraks

Considering that 6psi can support 500hp i'd be looking at lowering that for a start and also fuel maybe leaking in after the engine has switched off does it have a fuel solenoid on it to stop such an event from happening .

Yes it has a fuel idle solenoid.
Compersion is preaty much all the same.
Maybe 4 psi-5psi fuel pressure might work.
Just waiting for a dyno tune to be put in (3 week's) so it can get sorted.
Thank's for all the help.
Cheer's Al

nobraks · 10-02-2010, 10:43 AM

Cool mate , good luck !

Struggler · 10-02-2010, 04:47 PM

Mechanical or electric fuel pump ?

Reason I ask is I have seen mechanical pumps leak fuel into the sump, its fairly common on 308's.

TUF 253 · 10-02-2010, 04:55 PM

Quote:

Originally Posted by Struggler

Mechanical or electric fuel pump ?

Reason I ask is I have seen mechanical pumps leak fuel into the sump, its fairly common on 308's.

yeah, tell me about it!!

tanka5.7 · 10-02-2010, 05:04 PM

Quote:

Originally Posted by alstgg180

The carbie has just been rebuilded.

i lol'd

stuartmathew · 10-02-2010, 09:05 PM

The easiest way for this to happen is for the rings around the tops of the pistons to be cracked (ie., broken) and gasoline will leak past them into the oil pan. If that's the cause, it's time to re-mortgage the house. It only takes one ring on one piston, too. Have a compression test done on the cylinders to see if this is it. With the help of a friend and a compression tester (a pressure gauge basically) that'll cost you about $50, you can do this test your self.

10-02-2010, 08:26 AM	#1 (permalink)
alstgg180 Provisional Driver Join Date: Nov 2007 Location: N.S.W Ride: Blown Tg Gemini View My Photo Gallery Minesweeper Champion! Sonic Champion! Posts: 475	Have you had this problem before? Has anyone had a problem with the oil in the engine smelling like petrol? New oil and when ya pull the dip stick out the oil is a little black but has a strong smell of petrol. __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. YOUR NOT KNOWN UNLESS YOUR BLOWN

10-02-2010, 09:15 AM	#2 (permalink)
TUF 253 Team Manager Join Date: Feb 2009 Location: melbourne Ride: Blown V8 LH torana, 1964 pontiac parisienne View My Photo Gallery Posts: 2,293	that usually happens when your running the engine too rich and washing the bores, it can also be a leaky carby/fuel injector as when you turn the engine off it can leak down past an open valve and past the piston rings, gotta be careful mate cause fuel will destroy you oil pretty quickly(will loose its lubricating performance) or it could just be blow-by on ya piston rings, easy to tell just get a comp tester to check that one mate __________________ small cubes+big balls= blown tyres!! To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. Last edited by TUF 253; 10-02-2010 at 09:19 AM.

10-02-2010, 09:37 AM	#3 (permalink)
alstgg180 Provisional Driver Join Date: Nov 2007 Location: N.S.W Ride: Blown Tg Gemini View My Photo Gallery Minesweeper Champion! Sonic Champion! Posts: 475	Fuel pressure is set at 6 psi. Idle's at 800rpm The carbie has just been rebuilded. The manifold is ported, polished same to the head. The head has only done not even 500km since rebuild. The block has only done 16,000km. __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. YOUR NOT KNOWN UNLESS YOUR BLOWN

10-02-2010, 09:05 PM	#10 (permalink)
stuartmathew Newby Join Date: Feb 2010 Posts: 1	The easiest way for this to happen is for the rings around the tops of the pistons to be cracked (ie., broken) and gasoline will leak past them into the oil pan. If that's the cause, it's time to re-mortgage the house. It only takes one ring on one piston, too. Have a compression test done on the cylinders to see if this is it. With the help of a friend and a compression tester (a pressure gauge basically) that'll cost you about $50, you can do this test your self. __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

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10-02-2010, 10:00 AM	#4 (permalink)
nobraks Newby Join Date: Sep 2007 Location: sector 0054 Ride: cessna Posts: 17	Considering that 6psi can support 500hp i'd be looking at lowering that for a start and also fuel maybe leaking in after the engine has switched off does it have a fuel solenoid on it to stop such an event from happening .

10-02-2010, 10:43 AM	#6 (permalink)
nobraks Newby Join Date: Sep 2007 Location: sector 0054 Ride: cessna Posts: 17	Cool mate , good luck !

10-02-2010, 04:47 PM	#7 (permalink)
Struggler Licensed Driver Join Date: Jun 2008 Location: Canberra A.C.T. Australia Ride: UC Torana Sedan View My Photo Gallery Posts: 521	Mechanical or electric fuel pump ? Reason I ask is I have seen mechanical pumps leak fuel into the sump, its fairly common on 308's.