EA82 Port Pics please .

discopotato03 · Post by **discopotato03** » Sat May 26, 2007 7:23 pm

Hi all , in my travels (wreckers) I have seen EA81 inlet and exhaust ports but not EA82 so far . The 81's are a worry so I'm keen to see the 82's inlet and exhaust ports to get an idea how well they breath in and out . I'd like to have an idea of how much they can be improved with a bit of work around the short side radisus and valve guide bosses . I've seen some pics of the ports from the chamber side but not from the manifold faces .

Anyone have any ?

Cheers A .

bpm · Post by **bpm** » Sat May 26, 2007 8:35 pm

exhaust ports on the 82 are very similar to the 81, mpfi and turbo intake ports arent much chop either. the 2 ports on each head are different sizes. one is squashed to to clear a water jacket and manifold bolt thread. cant comment on the standard 82 head, never looked at one with much interest but similar to the 81 from what i remember.

my engine is together atm but i can send a pic of the intake gaskets if thats any help, it shows the horrid port shapes.

discopotato03 · Post by **discopotato03** » Sun May 27, 2007 8:15 am

I guess I'm going to have to get one and cut it up to see what can be done because its hopeless doing ANY performance mods if these critters can't breathe out . If there's space in the casting sections can be cut out and fabricated with sections of aluminium and TIG weld . I did read something about hydraulic lifter bores getting in the way of ports but cant quite remember . Have evil thoughts about welding those up and using rockers like the EA81 heads do for adjustment . It just depends on what things can't be moved or worked around . A huge leap forward would be to recreate the EJ20 twin port system but a lot would depend on whats where in the EA head casting . I understand all EA82 turbo heads are the same including the late/last Vortex ones but correct me if I'm wrong .
Also no doubt someone must know if there's any slim chance of the EJ20/22 head going on an 82 deck . Since no one talks of it I guess there's no chance , if so its a pity as the SOHC EJ22 head I looked at had real potential - small valves though .

Cheers A .

steptoe · Post by **steptoe** » Sun May 27, 2007 11:48 am

i know people in here over the years have ported their subie heads and got better performance. Some years back a trusted head man and race engine builder commented that the subie heads breathed ok as it was and the limitation was the inlet manifolding and carbs or even the hole the carb sits on - as is with lotsa makes.

EA81 and 2 inlet manifolds are interchangeable as far as bolting to heads

The EA82 takes on the valve configuration of the famed twin port EA81 heads being ex, in,in, ex, as opposed to std 81 in,ex,ex, in. so you'd think things have improved there.

I know twin carbs go much better than single on EA81 and got similar LPG performance with a manifold I grafted a Volvo 2.3l throttle body to, with just a bigger hole under it

The EA82 efi and turbo heads probably flow equally well despite their squashed port look. find old qikRX to see what he did to extract his power and whether much head work was involved

discopotato03 · Post by **discopotato03** » Sun May 27, 2007 5:32 pm

Yes I think the ports are going to be the make or brake on these engines . I really need to have one to play with to have an idea whats possible .

I'll see if I can get hold of quikRX if he'll share his ideas .

Cheers A .

bpm · Post by **bpm** » Sun May 27, 2007 7:11 pm

is this engine going to be forced? if so, intake ports are secondary on any forced inducted engine. just concentrate on getting the air to the port with at least restriction as possible. sure, you can gain some, but any intakes ports flow much more than you would think with a little boost thrown at them

Ben · Post by **Ben** » Thu May 31, 2007 10:12 am

discopotato03 wrote:I guess I'm going to have to get one and cut it up to see what can be done because its hopeless doing ANY performance mods if these critters can't breathe out . If there's space in the casting sections can be cut out and fabricated with sections of aluminium and TIG weld . I did read something about hydraulic lifter bores getting in the way of ports but cant quite remember . Have evil thoughts about welding those up and using rockers like the EA81 heads do for adjustment . It just depends on what things can't be moved or worked around . A huge leap forward would be to recreate the EJ20 twin port system but a lot would depend on whats where in the EA head casting . I understand all EA82 turbo heads are the same including the late/last Vortex ones but correct me if I'm wrong .
Also no doubt someone must know if there's any slim chance of the EJ20/22 head going on an 82 deck . Since no one talks of it I guess there's no chance , if so its a pity as the SOHC EJ22 head I looked at had real potential - small valves though .

Cheers A .

There was a kiwi mob a few years back that was boring out the EA81 inlet castings and making them dual intake port. Problem is that the EA82 reversed the intake and exhaust meaning you couldn't so this any more.

I guess the crap heads is why turbo subes are far more popular than the 'traditional' power finding methods (and it's easy)

discopotato03 · Post by **discopotato03** » Thu May 31, 2007 4:29 pm

How do you mean reversed the inlets and outlets , I assume you mean the valve order across the head .

Cheers A .

Ben · Post by **Ben** » Thu May 31, 2007 6:17 pm

discopotato03 wrote:I assume you mean the valve order across the head .

Cheers A .

You got it.

Ben · Post by **Ben** » Thu May 31, 2007 6:18 pm

Crap, maybe I had a brain freeze there.... I could be completely wrong - don't trust what I said!

steptoe · Post by **steptoe** » Fri Jun 01, 2007 11:15 am

like i said above...

as for the kiwi mob , you may be thinking of sub4 that have their own cast heads modeled on EA81 to go on 81 for planes and in rich boys MY's