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Anyone used the Cosworth V6?
tegwin - 12/5/09 at 09:01 AM

I am toying with the idea of using the cosworth V6 in the TVR.... give it a bit more poke and modern reliability...

But... so far as I can see, the more powerful BOB engine only comes with an auto box...

So I guess I will need the BOA without the variable intake jobbie that the BOB has so I can have a manual box?

What engine management would work best (read as LOCOST!) on this engine?

Its going in a 1972 car, so I guess I dont need to worry about emissions and or cats etc...

Are there any issues with running this engine in a different car?

omega0684 - 12/5/09 at 09:06 AM

nielP on the forum runs a viento with a cossie V6 in it, might be worth dropping him a u2u

vinny1275 - 12/5/09 at 09:18 AM

swmbo's dad had a 4wd Sierra with one of these in (I'm pretty sure it was a BOB), was mated to a manual box, so it is doable. Was a pretty good track car that, especially with the roll cage and slicks on..

mcerd1 - 12/5/09 at 10:04 AM

this sites got loads of info on converting to a manual box (4x4, but that just means less work if your sticking to 2wd)

linky

I guess you'd use a 2wd MT75 (or a T5 £££), I think its quite a common conversion for a capri / scimitar

[Edited on 12/5/09 by mcerd1]

cd.thomson - 12/5/09 at 10:12 AM

The only reason to go for the BOB is if you cannot find a BOA engine. Engine management on the BOB is significantly more complex.

mcerd1 - 12/5/09 at 11:46 AM

the other big problem with the BOB is the size of the plenum - its alot bigger than the BOA one

mr henderson - 12/5/09 at 12:09 PM

So what's wrong with an automatic?????


Bentleys etc don't come with manuals, nothing wrong with autos

John

tegwin - 12/5/09 at 12:27 PM

An automatic TVR? Come over here so I can give you a slap!

ned - 12/5/09 at 12:44 PM

chippy has a cosworth v6 in his car. it's taken me all morning to remember his username on here!

Chippy - 12/5/09 at 03:41 PM

BOA in the "Custard Pie" (<<<Pic)
The BOB is far from easy to fit, whilst the BOA is fairly simple. Mine has BOB cams, and Vectra V6 injectors, made 220 BHP on the RR, less than expected but mainly due to a crap exhaust system, (soon to be changed,(again)). If you want any info just drop me a U2U. Cheers Ray
PS. This site is very helpful.
Fordpower linky

Rob Allison - 12/5/09 at 09:44 PM

The BOB is a better engine than the BOA. Its got shorter heads than the BOA.
I run a BOB on the BOA ecu and loom, it makes more power than the BOA too.

Chippy - 12/5/09 at 10:06 PM

quote:

The BOB is a better engine than the BOA. Its got shorter heads than the BOA.


Hi Rob, would contradict that statement, the BOB has two simplex timing chains which are known to be a weak spot, and when/if they break the engine is scrap. The BOA on the other hand has a single duplex timing chain, I have known of race engines having siezed solid due to cam bearings locking up, and the chain has never been known to break, despite being 2.2 meters long. I will admit the the BOB is a "little" more powerful than the BOA, but if you fit the BOB cams in the BOA with better flowing injectors, the BOA is then more powerful than the BOB, by about 20 to 30 BHP. Cheers Ray

NS Dev - 13/5/09 at 06:56 AM

hmmm, have to say I would side with the BOB engine.......

The simplex chains can break and scrap it, but they rarely do, whereas the tensioner and skid system for the duplex chains on the BOA is a nightmare.

The BOB was supposed to iron out many of the glitches that were on the BOA.

I was involved with (though didn't personally do) a BOB sierra conversion, and that used a manual MT75 box (diesel one) with XR4x4 front half casing and rebuilt cluster with different ratios, some rare ford part iirc. You can use the std diesel cluster which works ok though. It ran megasquirt injection/ignition and std BOB triple coil pack.

[Edited on 13/5/09 by NS Dev]