Here are a few thoughts about heads.
The EJ22T has one cam per bank, actuating all four valves per cylinder
through hydraulic valve lash adjusters. 80 to 1.00 compression ratio.
The 98 2.5 has twin cams and solid lifters. It has as much horsepower
(but slightly less torque) in NA form than than a stock turbocharged
EJ22T. Displacement does not account for this much on an increase, so
it must breathe better. Perhaps its higher compression (9/1 I think,
maybe 9.5/1). The heads clearly have "NA" cast into them, which makes
me think they are somehow less "bulletproof" than true twin cam turbo
solid lifter heads.
Just to throw you a curve, the 99 RS 2.5 heads went back to a single
cam, with solid lifters and those are a little hotter than the 98 twin
cam heads.
If a person could put the 98 2.5 heads on an EJ22T engine and drop in
some super duper pistons, it could possibly be the "poor man's" 22B
engine for North American enthusiasts.
Let's hear some other opinions on this.
Bill Robinson
92 5sp Turbo Sedan
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98 RS 2.5 Twin Cam Solid Lifter Heads
Moderators: Helpinators, Moderators
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Dave aka DLC/dackampf
98 RS 2.5 Twin Cam Solid Lifter Heads
I wholeheartedly agree that the RS heads would be the best way to go,
but i think the 99-01 heads would probably be the best.
Byron's 93 Impreza sedan runs an EJ22T block, RS SOHC heads, T3/T04,
front mounted intercooler, BPM gearset, Kaaz diffs.
~600HP@~35PSI.
10.70@140+ MPH.
He told this to me, as i was standing in front of his car in the Kaaz
booth at SEMA.
--- In BC-BFLegacyWorks@egroups.com, "William D. Robinson"
<vultureboy@m...> wrote:
> Here are a few thoughts about heads.
>
> The EJ22T has one cam per bank, actuating all four valves per
cylinder
> through hydraulic valve lash adjusters. 80 to 1.00 compression
ratio.
>
> The 98 2.5 has twin cams and solid lifters. It has as much
horsepower
> (but slightly less torque) in NA form than than a stock turbocharged
> EJ22T. Displacement does not account for this much on an increase,
so
> it must breathe better. Perhaps its higher compression (9/1 I
think,
> maybe 9.5/1). The heads clearly have "NA" cast into them, which
makes
> me think they are somehow less "bulletproof" than true twin cam
turbo
> solid lifter heads.
>
> Just to throw you a curve, the 99 RS 2.5 heads went back to a single
> cam, with solid lifters and those are a little hotter than the 98
twin
> cam heads.
>
> If a person could put the 98 2.5 heads on an EJ22T engine and drop
in
> some super duper pistons, it could possibly be the "poor man's" 22B
> engine for North American enthusiasts.
>
> Let's hear some other opinions on this.
>
> Bill Robinson
> 92 5sp Turbo Sedan
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but i think the 99-01 heads would probably be the best.
Byron's 93 Impreza sedan runs an EJ22T block, RS SOHC heads, T3/T04,
front mounted intercooler, BPM gearset, Kaaz diffs.
~600HP@~35PSI.
10.70@140+ MPH.
He told this to me, as i was standing in front of his car in the Kaaz
booth at SEMA.
--- In BC-BFLegacyWorks@egroups.com, "William D. Robinson"
<vultureboy@m...> wrote:
> Here are a few thoughts about heads.
>
> The EJ22T has one cam per bank, actuating all four valves per
cylinder
> through hydraulic valve lash adjusters. 80 to 1.00 compression
ratio.
>
> The 98 2.5 has twin cams and solid lifters. It has as much
horsepower
> (but slightly less torque) in NA form than than a stock turbocharged
> EJ22T. Displacement does not account for this much on an increase,
so
> it must breathe better. Perhaps its higher compression (9/1 I
think,
> maybe 9.5/1). The heads clearly have "NA" cast into them, which
makes
> me think they are somehow less "bulletproof" than true twin cam
turbo
> solid lifter heads.
>
> Just to throw you a curve, the 99 RS 2.5 heads went back to a single
> cam, with solid lifters and those are a little hotter than the 98
twin
> cam heads.
>
> If a person could put the 98 2.5 heads on an EJ22T engine and drop
in
> some super duper pistons, it could possibly be the "poor man's" 22B
> engine for North American enthusiasts.
>
> Let's hear some other opinions on this.
>
> Bill Robinson
> 92 5sp Turbo Sedan
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jason grahn
98 RS 2.5 Twin Cam Solid Lifter Heads
>He told this to me, as i was standing in front of his car in the Kaaz
>booth at SEMA.
any pics of his car on your page yet?
Jason
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>booth at SEMA.
any pics of his car on your page yet?
Jason
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Dave aka DLC/dackampf
98 RS 2.5 Twin Cam Solid Lifter Heads
I'll put up a few, since you asked so nicely 
--- In BC-BFLegacyWorks@egroups.com, "jason grahn" <jgrahn555@h...>
wrote:
> >He told this to me, as i was standing in front of his car in the
Kaaz
> >booth at SEMA.
>
> any pics of his car on your page yet?
>
> Jason
>
>
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--- In BC-BFLegacyWorks@egroups.com, "jason grahn" <jgrahn555@h...>
wrote:
> >He told this to me, as i was standing in front of his car in the
Kaaz
> >booth at SEMA.
>
> any pics of his car on your page yet?
>
> Jason
>
>
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http://explorer.msn.com
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