Head Help

[mastadd]

Ok so Im currently in the process of getting the head sorted for the L24 in my c110,

Unfortunately the original head was well and truly stuffed.

SO i got a E88 head of an 260z, but the guy i was going to use to get the head ported crack tested etc, is adamant that it will not work without Dropping the compression way way down.

I always thought for the most part the heads were more or less interchangeable, another mate who has done it all b4 tells me that it will work with out a problem. I guess i want to know who's correct. and who the fuc can i take the head too that will be happy to do the work!

thanks in advance!

[Ghostrider]

What are your plans for this head??

You doing a turbo conversion or normally aspirated (carby) engine???

If your going with your stock OEM carby set up, you might want to look at multiple carbs (twins off 260Z) or maybe a Webber for better response and a better cam, but for the most part it is interchangeable and your head guy has his head up his proverbial ass.

You might get a slight increase in compression with the E88, but that, I think is a good thing, as most of the 240K's were a little lacking in the compression dept and your not going to see any pinking until you're approaching the 10+:1 mark and or trying to use standard ULP fuel.

Remember your 240K was about when super grade fuel was about 95+ RON octane and it had lead in it to boot.

Cheers, D

[NightMonkeyII]

Super was 101 RON octane, was purple and smelt good!

[Ghostrider]

The only super fuel, mass produced in my day that was 100+ RON octane was Fleetwing 100. It was produced by the Boral Refinery at Kurnell and took the NSW performance car industry by storm and was soon bought out by Caltex and shut down.

If you do your research & not have a shot in the dark, I think you will find about 97 RON octane was the standard off the shelf Super grade leaded petrol produced until it's demise.

D

[mastadd]

Thanks Guys, im all for more compression, this is for my stock AUTO coupe so im not overly worried about cams and webers ...... atm,

my other c110 used to love E10 Unleaded 95ron did the trick for a fair few years.

[Ghostrider]

It would be a very good idea to change the cam when you're changing the head. That's why I suggested the cam change.

Out of interest, what cam is in the E88 head you acquired?

Cheers, D

[Ghostrider]

This might be worth a look as it's down your end of the country.

http://cgi.ebay.com.au/Datsun-240z-260z-28...=item2ead3bb193

D

[mastadd]

It would be a very good idea to change the cam when you're changing the head. That's why I suggested the cam change.

Out of interest, what cam is in the E88 head you acquired?

Cheers, D

just a stock 260z Cam, i know its going to be better than what my other coupe in it, i will be sure to check out the option of a new cam tho.

[Ghostrider]

Slide the cam out of the towers & check the code stamped in the back.

If it's a C you have the best cam you can get for your car, be better if it was a manual, but such is life.

If you want to upgrade your carby to twins, try to source a manifold & then source the twin SU's off the Triumph 2500TC. The 2500TC SU's are 1 3/4 as opposed to the 1 1/2 on the 240 & 260Z's. They might be a bit sluggish off the line, but mid to top end will be exemplary.

Cheers, D

[mastadd]

Slide the cam out of the towers & check the code stamped in the back.

If it's a C you have the best cam you can get for your car, be better if it was a manual, but such is life.

If you want to upgrade your carby to twins, try to source a manifold & then source the twin SU's off the Triumph 2500TC. The 2500TC SU's are 1 3/4 as opposed to the 1 1/2 on the 240 & 260Z's. They might be a bit sluggish off the line, but mid to top end will be exemplary.

Cheers, D

Well its an 'A' Cam.

[noddle]

Well its an 'A' Cam.

I run a 'A' Cam on my turbo L24, from my research, it the best 'N/A' cam to use on a turbo engine..

Nigel

[NightMonkeyII]

If you do your research & not have a shot in the dark, I think you will find about 97 RON octane was the standard off the shelf Super grade leaded petrol produced until it's demise.

Im not going to argue with the fugures, but a sprint car racer told me this. not a stab in the dark.

[Socrates]

Maybe sprint cars take higher octane fuel?

[Ghostrider]

I run a 'A' Cam on my turbo L24, from my research, it the best 'N/A' cam to use on a turbo engine..

Nigel

That's interesting Nigel, Stewart Wilkins thinks the same way and I have an A cam here for future testing, but for now, I'm building an L28et with some fairly wild cam timing, trying to produce sh!t loads of Torque as opposed to mass HP. I'm going to use a cam in the 256 degree bracket plus a vernier cam gear.

D

[noddle]

That's interesting Nigel, Stewart Wilkins thinks the same way and I have an A cam here for future testing, but for now, I'm building an L28et with some fairly wild cam timing, trying to produce sh!t loads of Torque as opposed to mass HP. I'm going to use a cam in the 256 degree bracket plus a vernier cam gear.

D

I foud out about it, from here,

http://forums.hybridz.org/

one of the members, who builds heads and such mentioned it, and he know what he's talking about.

Nigel

[coupe72001]

Sorry to wade into this late, but I'd just like to recommend you use your stock E88 head with your stock L24. The E88 head has large round combustion chambers (rather than small kidney-shaped ones) so you should actually get lower compression than some of the other L heads around. BUT! You do get the largest intake valves, and almost the largest exhaust valves of all the L heads, so it's going to breathe very well.

In addition, your L24 has slightly dished pistons (if it's from your 240k), so overly high compression is not going to be an issue. In fact you could consider a 1mm gasket to increase the compression some given you'll have a little extra valve clearance to play with. I've run an E88 with flat top pistons with no hassles (other than my own incompetence putting it together).

Finally, give Motor Improvements a call on 9555 8278. Last they were in Bricker St Cheltenham, but they were looking to relocate, so I'm not sure what their address is now. They help me out quickly and cheaply every time I smash up my heads (which is alarmingly still quite often). They won't lead you down the garden path.

[Socrates]

On the topic of heads, did any L series 6cyl heads come in crossflow?

[mastadd]

Sorry to wade into this late, but I'd just like to recommend you use your stock E88 head with your stock L24. The E88 head has large round combustion chambers (rather than small kidney-shaped ones) so you should actually get lower compression than some of the other L heads around. BUT! You do get the largest intake valves, and almost the largest exhaust valves of all the L heads, so it's going to breathe very well.

In addition, your L24 has slightly dished pistons (if it's from your 240k), so overly high compression is not going to be an issue. In fact you could consider a 1mm gasket to increase the compression some given you'll have a little extra valve clearance to play with. I've run an E88 with flat top pistons with no hassles (other than my own incompetence putting it together).

Finally, give Motor Improvements a call on 9555 8278. Last they were in Bricker St Cheltenham, but they were looking to relocate, so I'm not sure what their address is now. They help me out quickly and cheaply every time I smash up my heads (which is alarmingly still quite often). They won't lead you down the garden path.

Thanks Man ill get in touch with them tomorrow

[Ghostrider]

On the topic of heads, did any L series 6cyl heads come in crossflow?

Only one!

OS Giken made it for the race 280ZXT's & they were DOHC as well and I haven't seen one since the very late 80's.

And parts for them are no longer available.

D

[Socrates]

Interesting, any other L series 6 heads come out with DOHC other than the OS GIKEN one?