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ef different to el head? 

 

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 Post subject: ef different to el head?
Posted: Mon Sep 24, 2007 5:59 pm 
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perhaps this has been asked before but i couldnt find it so, i want to know what the difference is between ef and el heads, and if the xr6 from both are the same? hm engines have 2 different part numbers for ef and el which threw me, and i wanted to buy my mates ef xr6 head for my el but is it a straight swap? thanks

 

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Posted: Mon Sep 24, 2007 6:06 pm 
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Theres 3 types (even more if you concider the Tickford ones as individuals)

EF 94DA
EL 96DA
Late EL 96##? not too sure on the numbers.

EF and EL are interchangeable.

However Late EL's are a Hybrid head, Still will fit on, as long as you have the Cam and rockers than go with the corresponding head.

Hybrid heads have tapered valve springs, and a lower rocker ratio, so If you install EF rockers on a hybrid head, you'll kiss the pistons with the valves.

Some say the Hybrid heads are lower in flow rates, and are pretty much only good for gas motors. some say otherwise.

 

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Posted: Mon Sep 24, 2007 6:09 pm 
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but if ive got a standard el head and my mates is a ef xr6 head thats cool to swap over to get the bigger ports? nothing else really the difference?

 

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Posted: Mon Sep 24, 2007 8:14 pm 
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ELFAIRY wrote:
but if ive got a standard el head and my mates is a ef xr6 head thats cool to swap over to get the bigger ports? nothing else really the difference?


The XR head has different shaped ports and are alleged to be smaller.
This helps in air speed. The main benefit is the larger valves and cam.

Standard heads are better to port and 'do up' for 2 reasons..
cheaper
and porting is easier (i've been told)

You might notice top end is better with the XR head and Sure, if both are off and yours needs to be put back together, I'd certainly use the XR one!

 

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Posted: Tue Sep 25, 2007 11:11 am 
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Krytox wrote:
Theres 3 types (even more if you concider the Tickford ones as individuals)

EF 94DA
EL 96DA
Late EL 96##? not too sure on the numbers.

EF and EL are interchangeable.

However Late EL's are a Hybrid head, Still will fit on, as long as you have the Cam and rockers than go with the corresponding head.

Hybrid heads have tapered valve springs, and a lower rocker ratio, so If you install EF rockers on a hybrid head, you'll kiss the pistons with the valves.

Some say the Hybrid heads are lower in flow rates, and are pretty much only good for gas motors. some say otherwise.


arnt the standard heads?

EF 94AB
EL 95AA
EL Hybrid 96DA-6090....

and tickfords

EF 94DT
EL 95DT
EL Hyrbrid 96DT??

 

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Posted: Tue Sep 25, 2007 3:00 pm 
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millsy81 wrote:

arnt the standard heads?

EF 94AB
EL 95AA
EL Hybrid 96DA-6090....

and tickfords

EF 94DT
EL 95DT
EL Hyrbrid 96DT??


That seems right?¿

 

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Posted: Tue Sep 25, 2007 9:38 pm 
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Krytox wrote:

Standard heads are better to port and 'do up' for 2 reasons..
cheaper
and porting is easier (i've been told)



easier to port? they are made of the same stuff. and tickford heads have part of the work already done. no to mention come with larger valves already fitted.

to fit the larger valves mean ditching the guides for AU guides to suit the smaller stem of the larger headed valves. You can't get the 41mm valves in the large stem anymore, not since the AU had them in all heads.

and if you have a tickford already how can it cheaper? to port a stock head

 

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Posted: Wed Sep 26, 2007 7:50 pm 
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Quote from Jim mock himself!

Anyways no one mentioned head material.
Maybe non xr heads are easier sourced.
Maybe if one was to do some headwork they would be K-lining and putting in larger valves.
I was under the assumption the standard heads having a different shape made them easier to port.

Maybe it works out cheaper?

 

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Posted: Wed Sep 26, 2007 7:58 pm 
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I believe the hybrid head (most '98 build ELs) also has the steel head gasket from AU, which doesn't seem to burn out. This is unlike the fibre gasket in EF and most EL non-Tickford 4.0 litre engines?
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Posted: Wed Sep 26, 2007 9:52 pm 
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When my hybrid engine EL died. The head gasket was a metal ringed fibre job.

Image

 

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 Post subject: confirmation or correction of JMM article
Posted: Mon Nov 19, 2007 8:44 pm 
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http://www.jimmockmotorsport.com/articles/treat.php

hi..

reading point number 5 in this article says that 94AB (which is what I have) is a tickford head though this thread seams to favour 94AB as being the standard EF head.

can someone confirm the JMM article or is the Jmm article incorrect?

{96EF futura}
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Posted: Mon Nov 19, 2007 10:49 pm 
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Quote:
® EB-ED heads are marked with the model year followed by AA. Tickford versions have a T. EF-EL heads are marked with the model year followed by DA. Tickford units of this era have the T and the model year followed by DT. Anything that begins with WR or 1R is an AU head. On Tickford AU heads, the WR is followed by a T. Also, the number ends in AC for standard heads while Tickford units end with AB. LPG heads have a green daub of paint and are stamped L.


for EF/EL it states
Year/DA means STD
Year/DT means Tickford
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Posted: Tue Nov 20, 2007 12:24 am 
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I have 94-AB, neither DA or DT.

Note the line.. "Also, the number ends in AC for standard heads while Tickford units end with AB. LPG heads have a green daub of paint and are stamped L"

this is where my confusion lies.. the article says AB heads are tickford but posts earlier in this thread favoured 94-AB as just standard?
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Posted: Tue Nov 20, 2007 12:02 pm 
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its a relatively easy task the hardest part is making sure the timings right and not breaking the timing chain tensioner arm things but if your careful you shouldnt break it, and dint f**k up the timing believe me on that one i learnt the hard way, the timing chain tensioner that you screw in is shorter then the ef one. their not exactly the same their are tiny differences but they make a big difference

 

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Posted: Tue Nov 20, 2007 4:17 pm 
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I have an EL gli (early one, november 1996 build) and my head is 94AB...this is what came on it i know for certain as parents owned it since knew..is it a stock EF head? or a tickford ef head? i would think a stock (and have always been under this assumption), haha though i would be stoked with a tickford one :P

would i have an ef head just as a run out of the remaining ones before EL's?

 

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