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Old 11-27-2003, 21:19   #1 (permalink)
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EF LPG Headwork

What should be done to the head of an EF or to make it better suited to LPG?
my car has done a headgasket.. so the head will have to come off soon!
the car is also copping a GRA Straight LPG conversion and so i'd like to get the head setup nicely so it can run LPG all the time, what else should be done to it to help in the way of LPG performance.
i don't want anything done to it that would impede if the engine copped a supercharger/turbo at some stage.
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Old 11-27-2003, 22:54   #2 (permalink)
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Re: EF LPG Headwork

well LPG has a higher octane than PULP so you can safely increase the compression and get a cam to suit LPG..
Im in the same boat .. running dedicated LPG and will be getting my head flashed up in the next fortnight after I get a 'stock' 1/4 mile time on Wed 3rd..Then i'll know and see the differnce hopefully
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Old 11-29-2003, 04:48   #3 (permalink)
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Re: EF LPG Headwork

Gas actually has an Euivalent octane to premium unleaded, it has a ron of 98. its octane figure is actually between 118 to 124 depending which fuel site you check, but they always have a ron in equivalence to petrol which is always 98.

nocking the compression up will help it a little, but its no good if you are thinking of turbo or supercharging later on.

The standard heads arnt to bad for gas, but you could always look at porting etc. Depending on the condition of your head it might be worth getting the seats done or re cut. and guides replaced.

If your going to put a cam in then heavier valve springs, can help.
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Old 11-30-2003, 23:47   #4 (permalink)
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Re: EF LPG Headwork

How can it have an octane rating (average?) of 118 to 124 and a RON of 98? There are three values given for octane, RON, MON and an average.. RON is research octane number, and is the highest number you will get, because it is done in optimum conditions. MON is sort've representative of a vehicle engine environment (higher temps, higher rpm engine), and the average is somewhere between the two.

Anyway, apart from that, the I6s dont respond very well to compression increases at all (like, you wont notice much power increase at all.. and after about 12:1, it'll decrease, obviously), so don't bother.. for the money, just get one of those GRA voodoo cams, and save up for the day lpg injection takes off.. if it ever does.
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Old 12-01-2003, 02:11   #5 (permalink)
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Re: EF LPG Headwork

You might as well shave the head down to about 10 - 10.5:1.

If you decide to upgrade the cam, i'd suggest getting a wade cam. Thier I6 cams are awesome and they will find one that will get the EF flying!

Make sure you have some money aside to have the timing changed to suit straight LPG, without this you car will always be a slug that pings a lot.

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Old 12-02-2003, 04:41   #6 (permalink)
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Re: EF LPG Headwork

Not really sure how that octane works but i could send you the information on gas so you could see it for yourself. Or you could have a look at the impco website, on there you can find a download book of information called foxy factors which they go on about octane ratings of gas in there.

But basically it says what i said about the equivalent octane to petrol being 98.
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Old 12-02-2003, 06:53   #7 (permalink)
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Re: EF LPG Headwork

ohh and on LPG only you don't need the cat converter, I have driven a 351 clevo doing 248rwkw on LPG only and trust me it din't feel slugish on the road
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Old 12-02-2003, 06:54   #8 (permalink)
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Re: EF LPG Headwork

just remembered, LPG is quite heavy compared to air so will you use port injection for LPG?
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Old 12-03-2003, 07:05   #9 (permalink)
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Re: EF LPG Headwork

Dont get your head decked to run a higher CR with gas

you'll need another head for when you blow it

I'd call up someone like TSA, they do lotsa gas stuff. A decent head rebuilder worth his salt will know anyway. Ever thought about getting a XR6 head and starting with that?
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Old 12-03-2003, 16:55   #10 (permalink)
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Re: EF LPG Headwork

Quote:
Originally Posted by sikEA
Dont get your head decked to run a higher CR with gas

you'll need another head for when you blow it
Really, done that before have you?

10-10.5:1 is fine for LPG provided your timing is correctly setup, especially with an alloy head. My XE has been running LPG only for over 4 years at 10.5:1 and it has less pinging problems than my XF had running the same ratio on premium.

I run nearly 11:1 with the cast heads in my 351 and don't have any problems at all (but to be fair the cam in the 351 does have a larger amount of overlap than most I6 cams).
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