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Guest Message by DevFuse
 

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DUAL PORT HEADS!!! (EA-81)


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22 replies to this topic

#1 Guest_SubieSTORMTROOPER_*

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Posted 07 August 2003 - 03:11 PM

OK, just talked to a guy from a Idaho-based company...This guy has an Ea-81 motor that gets 200hp!! Normally Aspirated!!

Problem, is his parts cost an arm and a leg. He's been doing this for 7 years, and all of his parts are thoroughly tested. Without his custom pistons/cyllinder work, I got him to quote me on a hi-po kit that would get our old skools doin standstills!
The kit would cost $1250 ea. for a bulk order of 10, and would include the following:

Two custom Dual Port heads (ported &polished) (two for intake, two for exhaust!) not a reground, but a brand new custom cam-shaft, custom stainless steel valves, HP springs, bronze rockers, custom intake manifold, made for Weber carb, and something I'm leaving out.

This kit has been extensively tested IN AIRPLANES, so you know the parts are reliable, and the kit itself will get any EA-81 motor putting out 140 horses, and breathing like an olympic runner from Ghana. He's sold one kit to a suby car driver in Philly, and said it turned his car into a "rocket".

This is a great deal for the benefits that your car would reap, but the price may be the deterring factor. If we wanted to do single port heads (the ones we have), and have him open the ports up and port and polish, not to metion milling the head face for a boost of compression. That option is a bit more reasonable on the wallet, but only by $250, which would get the motor to crank out about 110-120hp, his quote is roughly a $1000 ea. for 15 orders, and he'd need $7000 to get started, plus the cores. the price would go up to $1400 for any individual order.

Also, he has a kit that includes hi-po main bearings, pistons, and more, but for much dinero:|

#2 Guest_rXSNRG_*

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Posted 07 August 2003 - 04:00 PM

Awesome. I'll take the 15 pack:cool:

#3 Guest_JwX_*

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Posted 07 August 2003 - 04:05 PM

is that 1000 per head or is that 1000 for an order of 15?

#4 Guest_SubieSTORMTROOPER_*

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Posted 07 August 2003 - 04:23 PM

sorry..kits are exactly $1049 each for a bulk order of 15...less bulk = higher individual price...passenger and driver side head included in kit, along with all the other goodies, but remember that's for single port head, but it is High Flow for sure..

#5 Guest_UltimateRX_*

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Posted 07 August 2003 - 04:33 PM

Subaru did make a dual port EA81 head, it was on the engine that was used on the last of the Gen 1 RXs. By the way, most of the RXs we identify with are Gen 2s. But it could be argued that there was a RX built in the mid 70's with a 1400cc engine, I've seen a picture of it, but I think it is considered the first of the Gen 1 RXs. The 1800cc engine had dual downdraft Weber carbs, it looked really sweet. Those heads are truely the holy grail of EA81s.

#6 Guest_JwX_*

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Posted 07 August 2003 - 05:08 PM

yeah those would be sooo cool<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/grin.gif ALT=" >D"> anybody have any pics of them?

#7 Guest_SubaruJunkie_*

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Posted 07 August 2003 - 05:47 PM

Sub4 has Dual Port intake and exhaust heads. Think they wanted $450ea.

This dude, does he take single port heads and modify them?? Or does he have a machinist actually re-create the EA81 head with dual ports?

Also, im assuming the manifold is custom made as well. Is it aluminum? Steel? Carbon fiber or what?

$1200 is steep. But might be worth it for the right setup.

-Brian

#8 Guest_SubieSTORMTROOPER_*

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Posted 07 August 2003 - 06:02 PM

These guys create their own dual port setups, that's why it's a couple hundred more, cuz your core would be worthless. He's the U.S. distributor for SUB4 parts too, so their cheaper than tryin to score them from the Land of Oz.

#9 Guest_SubaruJunkie_*

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Posted 07 August 2003 - 06:07 PM

Sweet. Those SUB4 heads are nice... but are they really worth it? I like the price of the other hi-po kit you posted about. I like the idea of having roller rockers tho.

-Brian

#10 Guest_GlCraigGT_*

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Posted 07 August 2003 - 06:08 PM

dose he offer the distrbutor cap needed to make the 2 spark plugs per cylinder work

#11 Guest_SubieSTORMTROOPER_*

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Posted 07 August 2003 - 06:26 PM

the dual ignition system is available from a few different companies..

Brian--- It's really up to us to decide what is the best deal..Since we aren't polo-tee wearing yuppies that can drop $9000 on a complete 200hp Ea-81 motor with a water-cooled turbo, supercharger and intercooler setup, with custom pistons and the whole nine, we might be able to come up with our own way of being "Ghetto Fabricus":p

The work to be done on the heads is explained on the site www.jodel.com under the subaru engines (2) page...though not as thoruogh as the airplane machinist guy is offering, (no 1/8" grinding into the ports, or custom stainless valves) but you will acheive a higher compression (9.2:1) and greater breathability, alongside a reground cam from Delta Camshafts which will only cost you $120 for the cam, and another $45 a head at a local machine shop.

#12 Guest_jcdenton_*

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Posted 07 August 2003 - 11:59 PM

Hello, what compression ratio do the dual port heads make your engine?

What are you leaving out?

thank you.

#13 Guest_jcdenton_*

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Posted 08 August 2003 - 12:18 AM

Hello, also what would the power band on the new cam be?

I am guessing it would peak at 4 - 5 thousand rpm, right? Where most people don't usually run it at (at least me).

also, the manifold is made for the Webber carb, most likely the 32/36, but will the 38 also fit? it would probably have enough flow for the 38. that was the main problem, the stock manifold didn't have enough air flow for the 38 to have any benefits over the 32/36.

thank you.

#14 Guest_SubieSTORMTROOPER_*

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Posted 08 August 2003 - 01:39 AM

I'm pretty sure he said 9.3:1, but that can also be achieved in a regular ol' single port head, by milling 0.040 off the head face.

The 38 is meant to be a bolt-on on the manifold no prob, and yes the power curve peaks at 4000 rpm +/- 500 rpm., but you can hold it at 4000 for days without hurting anything.

#15 Guest_subyaddict_*

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Posted 09 August 2003 - 02:52 PM

Does he have a web site?
Could you give me the phone #?
Dual-port ea81 would go great in my rally wagon.
Although I would rather have F.I. instead of Carb.
I am assuming this guy will do any of the above.
I am very interested in making my '83 wagon 200hp!
That would be awesome!
Nathan

#16 Guest_archemitis_*

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Posted 09 August 2003 - 03:58 PM

but if its made for airplanes, they only need peak horse power at the rpm they pick. will this thing be gutless out of the hole untill you hit 4grand. the compression would help the low end, but it would suck to make 200 hp at 4500 and only 50 at 4k. boost it with spfi and you will get 140 i would guess.
and what polo-tee wearing yuppie would be caught dead in an 80s subie:rollin:

#17 Dante

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Posted 20 October 2003 - 01:13 PM

Originally posted by SubieSTORMTROOPER
Without his custom pistons/cyllinder work, I got him to quote me on a hi-po kit that would get our old skools doin standstills!
The kit would cost $1250 ea. for a bulk order of 10, and would include the following:

Two custom Dual Port heads (ported &polished) (two for intake, two for exhaust!) not a reground, but a brand new custom cam-shaft, custom stainless steel valves, HP springs, bronze rockers, custom intake manifold, made for Weber carb, and something I'm leaving out.



Sounds like a pretty good deal. I'd be interested in learning more--particularly about the torque and power curves.

Lately, I've been trying to find an alternative to the restrictive coolant-heated OEM intake manifold. So far I have not found much except for SUB4 and Ram's (below), all of which are pretty darned spendy:

Twin carb Mikuni Intake system....................$849.95
Single weber system..(fabricated intake)..........$1059.95

I've got an article on building a carbon-fiber intake manifold, but it looks like more trouble than it's worth for me...I'd rather spend the $1,250 and get the other goodies, too.

#18 bushbasher

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Posted 20 October 2003 - 01:29 PM

the thing that REALLY changes were the ideal rpm is is the cam. The heads also affect it, but they are higher flow, so they will be much better than stock until you get to that rpm where they are really really better than stock.

#19 Dante

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Posted 20 October 2003 - 01:33 PM

Sweet! Unfortunately, it looks like the interest in this thread had petered out before I resurected it. What is the name of the Idaho-based company subieSTORMTROOPER and how do we get ahold of them? :D

Originally posted by SubieSTORMTROOPER
OK, just talked to a guy from a Idaho-based company...


Ram will also convert heads to dual port. In another thread, ramperf said "You send your heads and the price is $995.00 to convert. This conversion is the intakes only but the exhaust is equalized and both are flowed. The intake is built for the flange of the throttle body you are using and flowed also for $555" for a total of $1,550 plus shipping to and from Ohio...

#20 StormTrooper

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Posted 20 October 2003 - 02:16 PM

trip to see that thread brought back..

Don from RAM performance quoted me on that order...but like I said, that's for Bulk orders of 10 or more, and the likeylhood of getting 10 broke rump roast sube heads together to simulataneosly put $1250 on some hi-po is damn near impossible...

Dunno about porting out single port heads...pretty sure what he uses are the freshly manufactured SUB4 Dual ports...

You can send him your single port heads, and he'll bore out the intake and exhaust, and send it back with larger custom valves, lifters, springs etc...that seems to me to be the way to go if you wanted to do that..

#21 Dante

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Posted 20 October 2003 - 02:57 PM

Originally posted by StormTrooper
You can send him your single port heads, and he'll bore out the intake and exhaust, and send it back with larger custom valves, lifters, springs etc...that seems to me to be the way to go if you wanted to do that..



Thanks! :-) I was wondering if you typed "Idaho" when you meant to type "Ohio" ;)

Couldn't you just order the parts and have a local head shop do the work to save on shipping? Either way, that would probably be better for my purposes--more bang for the buck.

What I am really most interested in is a somewhat reasonably priced alternative to the stock intake manifold wich I have read is (a) constricted and (B) heated by coolant running through it. I've heard ea82 manifolds flow better, but I'd prefer something like SUB4s or the intakes Ram sells, only cheaper ;) Maybe I'll have to try my hand at making one after all...

#22 StormTrooper

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Posted 20 October 2003 - 09:12 PM

I would be reluctant to take the heads elsewhere, as Don (RAM) is the manufacturer of the custom valves, and he knows exactly how to pimp out those heads to get what you need. It would increase the possibility for a higher margin of error to get the work done at various places than to just have RAM do it all. True, you can save some money, I'm sure, but his quality of work is guarunteed to be better, and sometimes a little extra $$ down will save a crap load of headaches and times...

#23 Dante

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Posted 21 October 2003 - 12:37 PM

Good point. Now what do I do about the stock ea81 manifold? I guess I could buy Ram's twin Mikuni or single Weber setup, or SUB4's but they cost too much IMO. Is it worth the trouble to go to an ea82 manifold?

I guess I could just decide how much I am willing to pay and then tell Ram exactly what I want and how much I can spend...




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