Best straight six engine donor?
Best straight six engine donor?
Author
Discussion

spoodler

Original Poster:

2,269 posts

177 months

Thursday 22nd September 2011
quotequote all
Right I'll be honest I have very little experience of owning modern stuff (that is post early seventies) but have driven plenty so know what they go like.
The engine in my '36 Austin is getting a little tired and I've been shocked at the price of spares to rebuild it so...in an idle moment I thought of replacing it with something more modern, but I don't know what would be suitable. I've heard that a lot of modern engines have immobilisers incorporated in such a way that makes them very difficult to use in a non-standard setting so I'd like to avoid those...
My first thoughts were various Jaguar engine/trans (cheap) or BMW (not cheap?) but which ones, and which to avoid? TVR (hmmm), Celica, Nissan something or other?
Ideally a manual option would be nice, and a straight six as the engine bay is long and narrow, no horrible smelly diesels please...and it must be rear wheel drive or simple to convert, carb's would be nice but even I realise that they all went long ago.
Any thoughts, and please don't just say Eb36a as it would be meaningless to me...thanks.

roverspeed

700 posts

218 months

Thursday 22nd September 2011
quotequote all
Pre Evo e36 M3 engine.

3.2 Straight 6 with 286 bhp

TonyRPH

13,453 posts

190 months

Thursday 22nd September 2011
quotequote all
What about an engine from one of the older Datsun 'Z' series?

260Z (2.6) / 280ZX (2.8)

Both very straightforward OHC engines - no fancy electronics or immobilisers to worry about.

Not sure about availability though!


davepoth

29,395 posts

221 months

Thursday 22nd September 2011
quotequote all
Jag is probably the right answer - an M3 engine will be all electronical and quite "peaky" in power delivery, whereas the old XK engine is carbs and points, nice and torquey, and available in anything from 2.4 up to 4.2 litres. also it'll look more "right" under the bonnet.

v8will

3,309 posts

218 months

Thursday 22nd September 2011
quotequote all
roverspeed said:
Pre Evo e36 M3 engine.

3.2 Straight 6 with 286 bhp
Was that not a 3.0?

bmthnick1981

5,317 posts

238 months

Thursday 22nd September 2011
quotequote all
v8will said:
roverspeed said:
Pre Evo e36 M3 engine.

3.2 Straight 6 with 286 bhp
Was that not a 3.0?
Yes.

gigjam

205 posts

173 months

Thursday 22nd September 2011
quotequote all
RB26

roverspeed

700 posts

218 months

Thursday 22nd September 2011
quotequote all
sorry, correct. 3.0

spoodler

Original Poster:

2,269 posts

177 months

Thursday 22nd September 2011
quotequote all
davepoth said:
Jag is probably the right answer - an M3 engine will be all electronical and quite "peaky" in power delivery, whereas the old XK engine is carbs and points, nice and torquey, and available in anything from 2.4 up to 4.2 litres. also it'll look more "right" under the bonnet.
Sorry I should have said, a Series 2 XJ6 4.2 and Mk10 manual 'box is what's under the bonnet at the moment...



crofty1984

16,808 posts

226 months

Thursday 22nd September 2011
quotequote all
a: awesome car
b: BMW straight 6 early 90's M3 if you have the money.

spoodler

Original Poster:

2,269 posts

177 months

Thursday 22nd September 2011
quotequote all
crofty1984 said:
a: awesome car
b: BMW straight 6 early 90's M3 if you have the money.
Thanks...
I'm warming to the idea of a BMW, I've got (or should have) about 250b.h.p. at the moment and don't want to drop much if I can help it. The Jag' is a bit juicy but more to the point is consuming rather a lot of oil as well and pressure is low, rebuild parts aren't cheap unless anyone knows better? I would rebuild it myself if I go that route but just for the fun got a specialist to quote me for the work - approx. £5000 hence me looking at alternatives. This is a genuine enquiry and not a wind up, I really don't know what is available and just need pointing at some viable options - I can't ask my mates as most of them are still running flatheads...

carl_w

10,379 posts

280 months

Thursday 22nd September 2011
quotequote all
How about the 3.0Si engine from a Z4? 265 bhp and significantly lighter than the iron block S50/S54 M-engines.

paulrussell

2,292 posts

183 months

Thursday 22nd September 2011
quotequote all
I would say get another 4.2 straight six Jag engine, as I think it's the best engine for your car. The reason I think that is because they are old and don't reqire a load of electronics. A newer engine just wouldn't feel right in my opinoin.

T16OLE

2,964 posts

213 months

Thursday 22nd September 2011
quotequote all
spoodler said:
Thanks...
I'm warming to the idea of a BMW, I've got (or should have) about 250b.h.p. at the moment and don't want to drop much if I can help it. The Jag' is a bit juicy but more to the point is consuming rather a lot of oil as well and pressure is low, rebuild parts aren't cheap unless anyone knows better? I would rebuild it myself if I go that route but just for the fun got a specialist to quote me for the work - approx. £5000 hence me looking at alternatives. This is a genuine enquiry and not a wind up, I really don't know what is available and just need pointing at some viable options - I can't ask my mates as most of them are still running flatheads...
What about a 323/ 325/ 328, all of which should be available for around £500

davepoth

29,395 posts

221 months

Thursday 22nd September 2011
quotequote all
If you are looking at something fuel injected, I'd go straight for an AJ6 engine. From what I can tell they will bolt up to your engine mounts and transmission, which will make the job much easier. There's also a 4.0 with a supercharger which is probably quite nippy.

spoodler

Original Poster:

2,269 posts

177 months

Thursday 22nd September 2011
quotequote all
davepoth said:
If you are looking at something fuel injected, I'd go straight for an AJ6 engine. From what I can tell they will bolt up to your engine mounts and transmission, which will make the job much easier. There's also a 4.0 with a supercharger which is probably quite nippy.
I wondered about this as I met someone at the weekend with a similar(ish) car running a supercharged XKR engine, it was "quite nippy" - around eleven second quarters, but I've been warned off the AJ6 with tales of unreliability, there seem to be plenty available tho'. I was told that secondhand a BMW unit would be a much better bet as they are bulletproof and that any used AJ6 is likely to be troublesome - unfortunately the info' on the net generally is unreliable and quite often contradictory, that's why I thought I'd ask on here!

mattley

3,029 posts

244 months

Thursday 22nd September 2011
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gigjam said:
RB26
A 25 would be a much more practical option but I like your opening pitch smile

Matt UK

18,080 posts

222 months

Thursday 22nd September 2011
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Would an LS V8 fit?

davepoth

29,395 posts

221 months

Thursday 22nd September 2011
quotequote all
Matt UK said:
Would an LS V8 fit?
Neither straight nor a 6?

B'stard Child

30,745 posts

268 months

Thursday 22nd September 2011
quotequote all
Gaz. said:
My head says a lump from a Supra but my heart says another Jaguar engine. The Jag engine would look like it was meant to be there too, unlike the M3 or Supra lumps.
I agree - find a rough XJR 6pot Jag and get the added bhp from the charger