Author Topic: Twin Cam L series for those in need of adventure and itchy pockets  (Read 1861 times)

Offline RBZ 260

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Went to visit this smallish shop in Adelaide that sell product called EvapoRust. Apparently good stuff for killing rust.

the place is called Bullet Cylinder Heads.

Got more than what I expected.

link here:

http://www.bulletcylinderheads.com.au/

Had a bit of a tour and quite impressive stuff. saw a custom SR20DET block , RB intake manifolds all designed and made from scratch out of billet.

I asked about of possibility of a Twin Cam head on an L series block.
The answer was yes.

He hasn't done it but hes capable of doing anything to customer specs or basing it on any design to adapt to the block.
1100HP SR20 block is sure impressive and in Brays 1200 ute and few other race monsters out there. So they guy knows what hes doing.

So for those that want a cross flow twin cam head based on RB or S20 (if u have the details) and not shy to part some of your hard cash (prob still lot cheaper than a S20 head or OS giken) maybe give Marcus a call.

so for your custom blocks and heads and being in AU maybe the hard to have twin cam L is not so hard after all. Maybe group buy make price cheaper.

now anyone got blue prints for S20 heads???  :P

« Last Edit: August 14, 2012, 03:27:38 PM by RBZ 260 »
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Offline dat2kman

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Re: Twin Cam L series for those in need of adventure and itchy pockets
« Reply #1 on: August 14, 2012, 03:44:02 PM »
Blue prints/design drawings for S20?
Dont think so!

Did you ask him the most important question,
How much?

Custom one, two three or even ten offs dont come cheap
I just race old datsuns:
Group S Historic 280Z ( not a zx but a USA 280z)
Group O/T Historic Datsun Sports 2000
Group G Datsun 120y  with FJ24 fitted( ex G. Fury)
Marque Sports Datsun Fairlady 1966 -SR20DET

Offline thriller

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Re: Twin Cam L series for those in need of adventure and itchy pockets
« Reply #2 on: August 14, 2012, 04:18:51 PM »
I recall hearing that the billet SR blocks are in or close to the five figure mark...

Offline NZeder

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Re: Twin Cam L series for those in need of adventure and itchy pockets
« Reply #3 on: August 14, 2012, 04:30:04 PM »
If you were to replicate any head I would go for the LY FIA approved item. You would have a large market for those of us who have class rules to built to. Having the fia LY head would be gold.

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Offline Gav240z

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Re: Twin Cam L series for those in need of adventure and itchy pockets
« Reply #4 on: August 14, 2012, 04:42:50 PM »
If you were to replicate any head I would go for the LY FIA approved item. You would have a large market for those of us who have class rules to built to. Having the fia LY head would be gold.

But what is the biggest advantage of the cross flow head over the regular L-series say P90 head? They are both single cam heads, just 1 has cross flow. I would think that with the R&D that Peter Mac has done with the L-series you would be better off investing that money in a regular P90?

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Offline NZeder

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Re: Twin Cam L series for those in need of adventure and itchy pockets
« Reply #5 on: August 14, 2012, 04:49:33 PM »
Well it would not really be in the extra flow it would be in header and intake design improvements.

And P90's are ok if you can get them, here in NZ they are like hen's teeth so we are doing very well with the N42 just need welding.

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Offline dat2kman

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Re: Twin Cam L series for those in need of adventure and itchy pockets
« Reply #6 on: August 14, 2012, 05:05:07 PM »
Crossflow gives you a pentroof design chamber, more airflow efficient
Exhaust outlet comes out a bit straighter, easy flow, carb inlets not suffer from heat issues.

Yes would be fantastic in Prod Spirts, but as it is a "competition variant" it would not be allowed in Australia
I just race old datsuns:
Group S Historic 280Z ( not a zx but a USA 280z)
Group O/T Historic Datsun Sports 2000
Group G Datsun 120y  with FJ24 fitted( ex G. Fury)
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Offline peter mc

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Re: Twin Cam L series for those in need of adventure and itchy pockets
« Reply #7 on: August 14, 2012, 05:42:54 PM »
don't make a head , make a ally block with a 91mm bore and tall deck so we can make 3.5 400hp race motors  the head we cam make work

Offline NZeder

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Re: Twin Cam L series for those in need of adventure and itchy pockets
« Reply #8 on: August 14, 2012, 06:16:16 PM »
Very true the L6 heads are not an issue cc is ;)

Could a sleeved LD28 block with a L20B front cover be tall enough? Will need custom head studs as the LD28 head bolts are larger.

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Previous
70 HS30-00016 240z
72 HS30 240z L型 2.8
71 HS30 240z L型改3.2
79 HS130 280zx
82 HS130 280zx T top
2x 73 KP710 160JSSS
74 KB210 120Y Coupe
71 510 1600 Deluxe

Offline RBZ 260

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Re: Twin Cam L series for those in need of adventure and itchy pockets
« Reply #9 on: August 15, 2012, 01:59:09 PM »
Blue prints/design drawings for S20?
Dont think so!

Did you ask him the most important question,
How much?

Custom one, two three or even ten offs dont come cheap


You right. custom stuff never comes cheap.

But for those that want a twin cam head on the old L maybe join forces and do a group buy. the more that join the cheaper it is.

I gave Marcus a call today as a rough estimate on costing.

One off design and manufacture you be looking at around $20k. Any further heads would be around the 8-10K mark. This all depends how many obstacles and time spent designing it.
So more people interested the smaller the initial outlay.

If someone knows how to design one on CAD, to save some of the R&D cost than only pay for machine time and chunk of alloy.Could be lot less compared to if  they do everything. Obviously they don't warrant the design.

Peter regarding the alloy blocks can be done but as above initial cost around 20k and than roughly 8-10k per block. the more interest cheaper it becomes.


I recall hearing that the billet SR blocks are in or close to the five figure mark...

more like 8k mark. As indicated by the website.

not cheap stuff. its for the ones chasing serious HP. Nobody said big HP is cheap or easy  ;D
« Last Edit: August 15, 2012, 02:59:42 PM by RBZ 260 »
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Offline d3c0y

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Re: Twin Cam L series for those in need of adventure and itchy pockets
« Reply #10 on: August 15, 2012, 04:10:18 PM »
You really have to ask at what point the engine stops being an L and you are doing the same thing just going off and buying an S54 BMW I6 or something else?
Not putting miles on your Ferrari is like not having sex with your girlfriend so she'll be more desirable to her next boyfriend.

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Re: Twin Cam L series for those in need of adventure and itchy pockets
« Reply #10 on: August 15, 2012, 04:10:18 PM »