View Poll Results: What motor will hold the most power on the stock shortblock?
4g63
86
94.51%
ej257
4
4.40%
too close to call
1
1.10%
Voters: 91. You may not vote on this poll
What motor will hold more power on the stock block?
Jan 14, 2004, 09:38 AM
#16
Originally posted by bluevilevo8
Awesome
thats the kind of response I was looking for.
BTW, on what dyno were these pulls made on, and what have you done to the head?
Awesome
thats the kind of response I was looking for.
BTW, on what dyno were these pulls made on, and what have you done to the head?
-kris
Jan 14, 2004, 09:41 AM
#17
Originally posted by WildRice
You asked about block; at the myevo site there is a Swede who is pulling 710 from the mitsu.. The Evo head allows more boost than the Sub before pre-ignition, the mitsu rolling assembly is proven to support over 400. Cast pistons may be the weakness as the steel crank and peened rods seem solid. RPM and cylinder pressure must be considered they will cause different failure points like piston collapse, rod collapse, rod cap faliure. Assuming not detonation, the crank should reach bending moment before shear at high rpm (dynamic load) or from pressure (static loading). The absolute values can be calculated using strength of matterials and mass parameters. Hope this helps.. Evo all the way, the power emerges from good head design and strong support below. Yes son, grampa's Evo is a hemi. can you say "boost to the max.?"
You asked about block; at the myevo site there is a Swede who is pulling 710 from the mitsu.. The Evo head allows more boost than the Sub before pre-ignition, the mitsu rolling assembly is proven to support over 400. Cast pistons may be the weakness as the steel crank and peened rods seem solid. RPM and cylinder pressure must be considered they will cause different failure points like piston collapse, rod collapse, rod cap faliure. Assuming not detonation, the crank should reach bending moment before shear at high rpm (dynamic load) or from pressure (static loading). The absolute values can be calculated using strength of matterials and mass parameters. Hope this helps.. Evo all the way, the power emerges from good head design and strong support below. Yes son, grampa's Evo is a hemi. can you say "boost to the max.?"
Jan 14, 2004, 10:09 AM
#18
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I believe the 4g63 will hold 500+ with the right tune. Also I am not sure where I heard this but doesnt the Sti have more drivetrain loss than the Evo. But either both great engines, my vote if for the 4g63. Easy to mod and takes a ton of boost 
Jan 15, 2004, 08:44 AM
#21
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There are several 4G63's on this board alone making 550 whp. 500 is no sweat with good tuning. 550 is probably near the limit, but so far the engines are handling it. There's no way the ej257 shortblock will go that high. The block isn't special at all like the 4G63- Subaru is using the same block in the forester now and will also use it in other cars in its line-up. The 4G63 can also rev much higher- 8000 rpm is no problem stock. 4G63 is a better block hands down- but once STI owners start going crazy with engine mods the EJ257 may come out the winner with its higher displacement.
Jan 15, 2004, 03:30 PM
#22
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Originally posted by Fourdoor
Who has bent some rods in an EVO?
Keith
Who has bent some rods in an EVO?
Keith
I should however have qualified my previous statement with our experience using pump gas and stock internals. The broken engine best known to me was also running about 1.5 deg of intake advance. Surprisingly, though the data log showed mucho detonation, the stock pistons seemed unblemished. No cracks, no melting. The MSD knock alert fitted was being monitored by a co-driver who didn’t quite understand what to look for. After the run the persistent protests of the MSD prompted further investigation. The rod was just tapping the bottom of cylinder bore!
Tomei make some very nice rods.
Jan 15, 2004, 05:44 PM
#24
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Originally posted by CLeeEvo
For clarity, the engines aren't forged?
For clarity, the engines aren't forged?
As for the poll, it seems the 4g63 squeaked out a victory here on evolutionm
Jan 15, 2004, 09:08 PM
#25
It's the old grade school thing... "My dick is bigger than yours." "Bull****!" "Well look at this!" "Oh..." "Told you."
Now I don't frequent the other boards, but seems to be alot more "well look at this" in the 4g63 camp... Keeping in mind, of course, I'd still like to have an STI for the old lady.
Now I don't frequent the other boards, but seems to be alot more "well look at this" in the 4g63 camp... Keeping in mind, of course, I'd still like to have an STI for the old lady.
Jan 16, 2004, 05:31 AM
#26
Originally posted by Braf
Various acquaintances have arrived at the figure of 500hp from personal experience tuning the 4G63 over the years.
Various acquaintances have arrived at the figure of 500hp from personal experience tuning the 4G63 over the years.
Keith
Jan 16, 2004, 05:35 AM
#27
Originally posted by Zeus
Now I don't frequent the other boards, but seems to be alot more "well look at this" in the 4g63 camp... Keeping in mind, of course, I'd still like to have an STI for the old lady.
Now I don't frequent the other boards, but seems to be alot more "well look at this" in the 4g63 camp... Keeping in mind, of course, I'd still like to have an STI for the old lady.
Keith
Jan 16, 2004, 06:03 AM
#28
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Norris design in the UK is running 800+BHP at the flywheel on his evo7 and he use his car as everyday transport!! This is the only 2.2ltr 4 cylinder that I know of that can handle that much!!!!
Jan 16, 2004, 06:38 AM
#29
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Originally posted by Fourdoor
If your aquaintances were dealing with DSM's (as myself and my friends were) then I understand. The stock rods in the DSM's are cast units, not forged like the rods in the EVO's. That is why I asked if you had heard of someone bending the rods in an EVO specifically instead of generic 4g63 rods
Keith
If your aquaintances were dealing with DSM's (as myself and my friends were) then I understand. The stock rods in the DSM's are cast units, not forged like the rods in the EVO's. That is why I asked if you had heard of someone bending the rods in an EVO specifically instead of generic 4g63 rods
Keith
Jan 16, 2004, 07:22 AM
#30
Originally posted by Braf
Our experience is with the Evo variant of the 4G63. I would welcome correction on this but I think the Evo engine is fitted with cast crank and rods. When I have had occasion to look at the rods they certainly appear cast to me.
Our experience is with the Evo variant of the 4G63. I would welcome correction on this but I think the Evo engine is fitted with cast crank and rods. When I have had occasion to look at the rods they certainly appear cast to me.
Keith