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Twin Turbo V6...cooling

3K views 79 replies 18 participants last post by  Animal 
#1 ·
Hi gang....i need some advice ;)
Im part way into stripping down and upgrading a cally V6 engine which is going in to a GTE. I have 2 T3 garrett turbos and a good friend that can make up the exuast manifolds for me to fit the turbos on each bank...the problem im going to have is the turbo that is at the rear of the engine will get ruddy hot..will one of the bonnet scoops work ok or will i have to introduce some type of air flow mod to the engine bay?

cheers :beer:
 
#2 ·
have you done any research into the water cooling (or lack of) for cylinders 5&6. I had a good look at this yesterday as I'm playing with v6's and looking at doing something very similar. I've identified 2 ways of cooling cylinders 5 and 6, but I'm curious about ways this has been done sucessfully in the past.
 
#3 ·
thats what i was looking over on the week-end also. lmao
the walls are thin, i know courtney did some thing like this but used 'copper' in the water tracks i think? and created some new ones near the cylinders.
My mate thinks a good heat shield will work but im still a bit unsure...what was your plan of action?
 
#4 ·
I'm not too bothered by air cooling, as there's loads of space and ventilation in the manta engine bay.

I'm looking at creating either 2 or 4 more waterways to promote water flow at the top of the bores.

I'm also tempted to redesign the cooling system so that the heads have a dedicated feed and return, and the block has it's own feed and returns. It'd give a lot more control over the cooling of the block, but'd be a load more work.
 
#5 ·
the extra water-ways are probaly the only realistic way out of this problem...i can get to a machine shop localy and give it a go..i see from you web site you are doing a 3ltr....is ther much difference between the 3 & 2.5ltr water ways.?
 
#7 ·
lmao to right.....rubber..hun...what rubber?
thinking of fitting some tractor wheels...might last longer but i think the wheel archs might get in the way... ;)
should be good on the strate just bad at corners...
 
#9 ·
lmao

i was thinking of some type of port work from a scoop on the bonnet, something simple that can just force the air to the turbo area..i could rig a fan up from the aux belt..
 
#10 ·
hmmm.. in a mk2 astra, it'd be a very very tight fit, you'd probably have to move the rad and chop the bulkhead to get some spacefor the turbo's. I would be surprised if there's enough space for a belt driven fan and ducting. in all that lot!

the 3.0L block is very similar to the 2.5.

Although I've built up the block for the 3.0L, I'm very tempted to strip it down and do the waterway work to it. It'll be N/A initially, but When I get bored, then I was going to use a couple of T3's on it (you got metro ones too?).

The other alternative is to supercharge it. more expensive up front, but much better power delivery. oh, and it runs cooler too!
 
#11 ·
Interesting reading this.

If i have mine long enough i`m just going to tune the NA unit. Turbo`s are all well and good but the generated heat the rear one would have would be enough to strip the paint off the bonnetlmao .

Mart
 
#12 · (Edited)
water flow is a strange animal :p
you think it may be better if you run the water pump a bit faster, but you may get eddies in the wrong places, *reducing* flow
you think it may be better to run the pump a bit slower, giving more time for water to do it's stuff, and you get localised boiling and hot spots
you think you can increase the diameter of the waterways to promote flow, and you actually decrease pressure, depriving remote spots of their cooling

...food for thought...:beer:

PS
if thought WAS food, I'd look like a sumo wrestler by now
...now where was that mint?:rolleyes:
 
#14 ·
yup, read up on all that.

John, do you know the details of the cooling mod which has been proven to work, or is it one of those hush hush things that people hide away to try to make money from?

My plan is to drill 2 small (3mm) holes, primarily to promote flow around the top of cylinders 5 and 6 (and maybe some 1.5mm holes by 3 & 4. The holes would enable flow from the bore waterways (high pressure) to the water intake pre-pump (low pressure). the advantage with this is that the flow will increase around the hotter cylinders, downside is that the water getting to the back of the water pump will be slightly hotter.

PS you calling me strange? lmao
 
#15 ·
animal...the small hole bores you are thinking of is the same thing i think courtneys done. i can remember someone telling me about angled holes in to the water ways and a water pump set up.

Someone has PM me about just doing ONE bank with one turbo and forget the back, i think this will cause problems?

and i had a design for a cooler which fitted into the wiper well that came down were the heater unit would have been and out on to the turbo were the heater pipes would have entered the dash which ment that i could cut the bay were the rear turbo would go and give it a bit move clearing...i will see if i can load the drawing.
 
#16 · (Edited)
Animal said:
John, do you know the details of the cooling mod which has been proven to work, or is it one of those hush hush things that people hide away to try to make money from?
the latter
The UK tuners failed to crack it, as they were looking in the wrong directions, then they got fed up.
The Germans/Dutch did crack it (enigma code?) hence Frank's 400-500bhp. Why do you think he went from 3.0 to 3.1, to 3.2? something was giving way and they were reboring as they went along!...

PS you calling me strange? lmao
Is you middle name 'flow'?
didn't think so...;)
 
#18 ·
Well, fitting the turbos is one thing (not easy in that bay I admit)
Intercooling the lot is another biatch.
Making serious power (to justify all this extra bits) and keeping the engine from melting is the biggest challenge though, eh?

Ie, how much power did this nice setup do, and how long did it last?

In that bay, I'd definately consider a supercharger and a chargecooler, but that's just me...:beer:
 
#19 ·
in the manta, packaging is easy, as you could fit a family of 4 in there quite happily at the moment. loads of space for the turbo's, intercooler etc.

Hmmm... John, did you actually see franks engine in the flesh, and were there any strange hoses banging about? Just wondering if they used an external plumbing solution, or if it was all modded internally.
 
#23 ·
Animal said:
Hmmm... John, did you actually see franks engine in the flesh, and were there any strange hoses banging about? Just wondering if they used an external plumbing solution, or if it was all modded internally.
Internal.
Frank Denker, he's got a website as well. Send him a private email, and ask to contact his tuner and see what you can get from him. You never know.
 
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