Suck-Through Turbo's for EA81 N/A

KERAZY · Post by **KERAZY** » Fri Jun 30, 2006 12:43 am

Hi,

I've recently come across another idea about my engine (EA81), a gemini 2L turbo suck-through setup.
I was wondering if:

A) it was even possible?

B) it was practical?

C) it would require more than just a fuel pump, turbo, and turbo-carby?

D) it would be any good; and

E) if anyone has done it to an EA81 before?

my budget is rather dim, so i was wondering if it was an actual cheaper alternative to an EA82T or EJ20K/G that actually worked?

The carburettor in question is a CD175 or something, what turbo would go onto it?

MUDRAT · Post by **MUDRAT** » Fri Jun 30, 2006 1:00 am

I reckon it's possible, an EA81 turbo might be a bit more practical though!

You should be able to get by with the original fuel pump, and if it's a suck-through setup I can't see why ye olde 32/36 Weber wouldn't work.

You could even use an engine-pipe and turbo from an EA82 turbo.

Dougz · Post by **Dougz** » Fri Jun 30, 2006 9:30 am

I was actually considering this. Have a brumby and a donor touring wagon with aftermarket turbo ea82. Was thinking of pulling the turbo off and doing something similar.. Not sure if it would work or be any good though..

KERAZY · Post by **KERAZY** » Fri Jun 30, 2006 8:21 pm

right... so can i use the same internals on an ea81 and run an EA81 turbo setup, through a 32/36 weber... is that what i just heard?

subanator · Post by **subanator** » Sat Jul 01, 2006 12:34 am

I think a sidedraft Weber would be better like 40 DOCE. Do some googling for some similar blow throughs.

I do seem to remember the standard EA81 head design doent lend itself very well to boosting, as detination dur to port layout is the problem, not so with a Turbo head EA81T as they are different. Look for Steve - Rising Sun comments in earlier posts.

tim_81coupe · Post by **tim_81coupe** » Sat Jul 01, 2006 2:39 am

My 2c worth....

I'd hate to try and tune a carburettered turbocharged engine. You'd have to play around with jet sizes for ages to get it right, and at the end of the day you'd still end up with a poor tune compared to an EFI motor. The factory EA81T's are EFI, as well as having a different head design to help prevent detonation.

The cost involved in doing all this would be a fair bit, remember if you're pioneering a conversion (ie have noone to help) it will cost you a whole lot more than if its a tried and true swap. I'm all for crazy conversions and definitely love seeing someone work outside the square, however I feel on this one the costs outweigh the gains.

I won't harp on about an EJ conversion too much, its obviously something you have given thought to. The cheaper option is simply an EA81 rebuild, maybe get a performance cam, shave the heads a little and freshen the old girl up. Won't go a whole lot faster than it does now but its guaranteed to be more reliable and even produce similar HP figures compared to a homemade turbo setup....

KERAZY · Post by **KERAZY** » Sat Jul 01, 2006 1:14 pm

good bye to the turbo idea hehe. nah i gotta change my rings up soon enough, so perhaps once the bits are all deconstructed ill see what i can do. cheers for that

BRUMBERTY · Post by **BRUMBERTY** » Sat Jul 01, 2006 2:15 pm

I put one together with a pair of SU's.
Screamed and wouldn't idle.
Good for WOT applications like hovercraft or jet boats.

Gannon · Post by **Gannon** » Sat Jul 01, 2006 4:10 pm

There was an ea81 turbo hatch from america that was used in the movie "Canon Ball Run" The car was known as "Quattro San"
It had a draw throught turbo setup that was designed by students at a Washington unerversity.

I will see if i can dig up some info

Suby Wan Kenobi · Post by **Suby Wan Kenobi** » Sat Jul 01, 2006 5:43 pm

You could always have a blow through setup with the carb, by building a pressure container for the carb you wouldnt have to play around with it much

MUDRAT · Post by **MUDRAT** » Sat Jul 01, 2006 8:29 pm

Bit tricky to tune a carby in a sealed box though, never fully understood how you could do that whole setup.

KERAZY · Post by **KERAZY** » Sat Jul 01, 2006 10:38 pm

whats to rejetting the carby then? ea82 apparently is a bit of an ass to get into an MY without major cutting and transplants, so no doubt ill keep this engine until i can afford a liberty half-cut, but to make things clear, its not worth turbo-ing a N/A ea81?

Suby Wan Kenobi · Post by **Suby Wan Kenobi** » Sun Jul 02, 2006 12:16 pm

From memory how a mate did it ages ago on a Datto he tuned it to run slightly rich on the carb then built the box and sealed it in there and it ran pretty good.

MUDRAT · Post by **MUDRAT** » Sun Jul 02, 2006 2:14 pm

Yeah I've seen a few on v8s and by all reports they run just as well as any other carby engine. Just never could get my head around the practicality side.

Kerazy, I reckon a carby EA81t is a good idea and I think you should give it a go.

Suby Wan Kenobi · Post by **Suby Wan Kenobi** » Sun Jul 02, 2006 7:45 pm

This was done in the days before EFI was really an understood thing

Subaman · Post by **Subaman** » Sun Jul 02, 2006 8:23 pm

Bang for buck it isnt really worth it these days is it?

KERAZY · Post by **KERAZY** » Sun Jul 02, 2006 10:15 pm

from what ive gathered, i wish it was. i could probably get the same result as a single 32/36 weber and a new muffler if i tried to do it, but i just like the feel of a turbo, as well as the sound. what sorta power would someone get out of a weber? at some point EJ20K would be goin in it, but til then, its weber unless i can find an EA82T n try to install it myself. so what can i get out of a weber?

Suby Wan Kenobi · Post by **Suby Wan Kenobi** » Sun Jul 02, 2006 11:04 pm

Unless you really really wanted to do it i would think the amount of time you would use setting it up would be wasted, go the EFI

KERAZY · Post by **KERAZY** » Mon Jul 03, 2006 12:43 am

right.....

Suby Wan Kenobi · Post by **Suby Wan Kenobi** » Mon Jul 03, 2006 8:05 pm

A weber will give you a more responsive engine and it will feel as though you have unleashed a heap of power.