can i put an I head on my non super eta without modifying the pistons or head?

[Ceeker]

This thread ______ is going wonderful.

my bad...:(

[Stephen]

He did all of that WITHOUT swapping pistons and had it faster than an I?

I thought you pretty much HAD to swap pistons or else it'd be slower than a stock E because of the low compression?

Guys, the effect of a small drop in compression dos not send your car spiraling in to the dark ages. It is WAY faster than a stock E, or even a chipped E. Compared to an i, the answers a little cloudier, but i'm sure mine would keep up just fine (without getting into gearing, bolt ons etc)

[Cabriolet]

heavier? they weigh almost exactly the same amount. how do they rob it of power?

my eta crank seems to do ok at 7.5k..

rods, not crank...

[nando]

I know what you said. the rods are still not heavier.

I've also seen snapped B25 rods, and S50 rods. what does that tell you?

[Cabriolet]

moar power is moar expensive =P

[acolella76]

I'm about to do something never done before on r3v, and post actual facts! :O

As far as CR goes, you will be looking at 8.44:1. DO NOT listen to any of the idiots that say 'oh its like 7:1 or 8:1' because it's not and they are talking out of their ass. Stock 'i' is 8.8:1, so .4:1 difference is not enough to even feel a difference.

You do not have to switch rods and THE M20B25 RODS ARE NOT ANY STRONGER. They are just longer. Which wouldn't even work because your piston would be sticking out of the block by about 5mm.

Here is my dyno graph. 85 eta with stock bottom end, 885 head with headers and a 272 cam. Untuned. Note that most 'i' cars make about 144whp untuned.. I'm sure when I actually get this thing tuned it should put down close to 160 and hopefully similar torque.



boom.

[nando]

yours is probably the strongest 2.7i dyno I've seen

[Cronopoulos]

BOOOOOOOOOOOOOOOOOOOOM Thank you!

[richardkeith97]

I'm about to do something never done before on r3v, and post actual facts! :O

As far as CR goes, you will be looking at 8.44:1. DO NOT listen to any of the idiots that say 'oh its like 7:1 or 8:1' because it's not and they are talking out of their !@#$%^&*. Stock 'i' is 8.8:1, so .4:1 difference is not enough to even feel a difference.

You do not have to switch rods and THE M20B25 RODS ARE NOT ANY STRONGER. They are just longer. Which wouldn't even work because your piston would be sticking out of the block by about 5mm.

Here is my dyno graph. 85 eta with stock bottom end, 885 head with headers and a 272 cam. Untuned. Note that most 'i' cars make about 144whp untuned.. I'm sure when I actually get this thing tuned it should put down close to 160 and hopefully similar torque.



boom.

thank you.

[MR 325]

Alex thank you for posting that. Maybe people can finally believe the info I give out? lol

[delatlanta1281]

Nice job Alex. I will say that your motor is crazy strong for a 2.7. I'm coming over and stealing it.

[digger]

I'm about to do something never done before on r3v, and post actual facts! :O

As far as CR goes, you will be looking at 8.44:1. DO NOT listen to any of the idiots that say 'oh its like 7:1 or 8:1' because it's not and they are talking out of their ass. Stock 'i' is 8.8:1, so .4:1 difference is not enough to even feel a difference.

You do not have to switch rods and THE M20B25 RODS ARE NOT ANY STRONGER. They are just longer. Which wouldn't even work because your piston would be sticking out of the block by about 5mm.

Here is my dyno graph. 85 eta with stock bottom end, 885 head with headers and a 272 cam. Untuned. Note that most 'i' cars make about 144whp untuned.. I'm sure when I actually get this thing tuned it should put down close to 160 and hopefully similar torque.



boom.

the stock b25 has very low compression already so any amount lower is a step backwards but it is not the reason why the 2.7I don't make more power than stock. It is the fact that most don't upgrade the breathing and the engine falls on its face. You have put a cam and headers which is the correct way to get more power from the bigger bottom end but have only made slightly more than stock and i have seen healthy B25 make more than this. Sure a custom tune will help but it does on a stock B25 aswell. Camming the low compression engine compounds the problem of low static CR and it hurts the low rpm performance. You need more compression to use the bugger cam more efficintly. I would be doing a fresh stock B25 before any of this budget 2.7i stuff and then a 2.7/2.8 with moderate CR.

I have not seen anyone really do a 2.7 with ETA crank, B25 Piston, B25 rod and deck 2mm off the top and use a cam gear and at the same time a refresh bottom end and topend.

For you guys its harder to do the 2.8 because your cranks seem to create fouling with the block and pistons which is a PITA to modify.

[BenM]

Well said digger. Also, the stock combustion chamber on the "885 (i) is a bit bigger than the "200" (eta) which also accounts for a lower CR when putting an 885 head on an eta bottom end.

[Vince30]

What did we learn? MR 325 is always right! And that dyno graph is awesome.

Just a suggestion, you might want to get an i cluster as well, unless you enjoy reading 5k when you are really doing 7.5k.

[CHIF8008]

i swapped a I head on my aluminum M20 block and get 300+ rwhp

Boom