So what are you Guys reving your 2.5L's to?

[black86glhs]

Yes.... solid lifter cam. No high performance engines run hydraulic lifters.

True, but it depends on the definition of "high performance engine." Not being a wise guy Steve, just that many people say and believe different things.

[Directconnection]

True, but it depends on the definition of "high performance engine." Not being a wise guy Steve, just that many people say and believe different things.

OK, change the words "high performance" to "Race"

[turbovanman²]

My 2.5 makes power all the way to 7000 when I had it on the dyno, and so far, its best passes have been winding out 2nd gear, but thats also because I have my gear ratio so damn low and running 26 inch slicks.

[turbo84voyager]

I have not had any of my 2.5's on the dyno but none of them seem to make any more power over 5,000. Because of this I almost never wind them over that. A friend of mine low 12 sec 2.2 T2 charger made max power about 500 rpm higher. His ET was the same shifting between 5,000 and 5,500 as it was if he would wind it any higher. In his case why kill the motor.

[t3rse]

My 2.5 makes power all the way to 7000 when I had it on the dyno, and so far, its best passes have been winding out 2nd gear, but thats also because I have my gear ratio so damn low and running 26 inch slicks.

16v...

[GLHNSLHT2]

I have not had any of my 2.5's on the dyno but none of them seem to make any more power over 5,000. Because of this I almost never wind them over that. A friend of mine low 12 sec 2.2 T2 charger made max power about 500 rpm higher. His ET was the same shifting between 5,000 and 5,500 as it was if he would wind it any higher. In his case why kill the motor.

And the setups on them are mostly stock right?

16v...

Simon's setup just goes to show you that with the right head the 2.5 will make power above 6grand.

[t3rse]

ford (lima) guys have a poor ratio and some rev to 9k...what is your point? no flow, no go.

[Pat]

But there's no way I'll be shifting down at 5000rpms.

You guys shouldn't be so fixated on specific rpm shift points. GLH's car is a 5 speed, so on every shift, it drops a specified rpm based on gear ratios. Gary's car was an auto...the rpm his motor dropped to on shifts was somewhat dependent on converter slippage.

The shift points it will go fastest is dependent on the area under the curve in the rpm range the motor will run in going down the track.

[turbo84voyager]

And the setups on them are mostly stock right?



Simon's setup just goes to show you that with the right head the 2.5 will make power above 6grand.

All of them were either fastburn or g-heads with light porting and back-cut valves.

Like others have said, every engine combination will be different and flow is the key. Simons numbers prove it. My experience with the 2.5 engine is 5,000 - 5,500 is usuially where these engines dont make more power using a stock or mildly ported sohc head which seem to be what many people have.

People used to rev the heck out of the ford straight 6 and those had long strokes. It was all dependent on the flow ( head, cam, intake, etc), a stock staright 6 makes a ton of low end power but also used to die at quite a low rpm.

Run it at the track and try different shift points and watch your ET's. If there is no difference shifting it at 5 grand and shifting it at 6 grand shift it at the lower RPM, no sense of beating the motor.

[LynX853]

I'm def gonna try out different shift points. I guess one of my variables is that even though its a 8v head, it is the 782R head which flowed at 205cfm@.499 lift. I guess the only real answer is real world track expirance. I'll have to see what happens this weekend. I've been waiting to run my new set up for a long time, and the time for it is a few days away.

[Directconnection]

Simon's setup just goes to show you that with the right head the 2.5 will make power above 6grand.

I agree with the "right" setup, but am betting his PEAK HP is not at 7,000, or even 6,500 rpms. Cliff Ramsdell's 2.5 16v T-III made peak hp just under 6,000rpms. And, I'll assume Simon's peak HP #s are the same.

Fawk... every 2.5 "makes power" at 7k, or hell, even 8k if it stays together.

[WickedShelby88]

Has anyone here built a balls out long rod motor yet?

[bakes]

Has anyone here built a balls out long rod motor yet?

I'm starting my Tall block build but its going to be slow due me changing jobs which cut into my play money . 88 tall block have 2 88 2.5 cranks
planing 1mm over 2.5 forged pistons saving up for custom ti. rods and wist pins and looking into a 4 bolt main kit ( i want a 2.5 bottom end that is bomb proof to 8k+ rpm )

[WickedShelby88]

Sounds like a revver. I would like to know what you are going to be revving your 2.5 to and where your HP will peak as well. With the longer rods it will probably peak low as well, unless you can greatly improve the V.E. throughout the rpm range. I know builders in the V8 clan of mopars are now taking advantage of the taller deck big blocks of the smog era and building some mountain engines!

[bakes]

I real don't like peaky motors they leave a lot a usable torque on the table i like very flat wide power bands I'm shooting for 6500-7000 rpm with possible over shooting in 1st to 7200rpm and I'm planning on boosting over 15 in 1st and up to 30# in all other gears I'm leaving the cam selection till last when gearing (auto / manual and final drive )is sorted out.
and there will be nitous and a hoslet turbo with a tube header to boot ,intake will be like boostgeeks http://www.turbo-mopar.com/forums/sh...ad.php?t=37923

[2.216VTurbo]

So since this is a 'rev to' thread now, I was trying to guesstimate how high to rev a 2l 16V motor that flows 260CFM IN and 305CFM EX with a 3.24" stroke and rods that are 6.37" long. roughly a 1.96 rod ratio I know Gary, exhaust backpressure to boost pressure ratio but lets assume the GT35R is *really* close to 1:1...

Been waiting on the crank for over 6 months

[black86glhs]

So since this is a 'rev to' thread now, I was trying to guesstimate how high to rev a 2l 16V motor that flows 260CFM IN and 305CFM EX with a 3.24" stroke and rods that are 6.37" long. roughly a 1.96 rod ratio I know Gary, exhaust backpressure to boost pressure ratio but lets assume the GT35R is *really* close to 1:1...

Been waiting on the crank for over 6 months

12,000 rpm FTW!!!!!

[GLHNSLHT2]

saving up for custom ti. rods

If you were planning on getting them from GRM (same place that makes aluminum rods) they've stopped making Ti Rods due to the price of the material.

[GLHNSLHT2]

So since this is a 'rev to' thread now, I was trying to guesstimate how high to rev a 2l 16V motor that flows 260CFM IN and 305CFM EX with a 3.24" stroke and rods that are 6.37" long. roughly a 1.96 rod ratio I know Gary, exhaust backpressure to boost pressure ratio but lets assume the GT35R is *really* close to 1:1...

Been waiting on the crank for over 6 months

Heh, well I've had my 2.5 to 7200, I plan on revving my 2.2 with a 1.75 rod ratio and 16v to 8grand at least, So I'd say 10k wouldn't be too out of the picture Alan. Might be a fun comparo, my 2.2 with more displacement to your 2.0 with more revs. Sounds like our heads and turbo selections are gonna be very close.

6 months is nothing. I've been waiting to get my head back for over a year now

[Directconnection]

Simons numbers prove it.

Simon hasn't posted #s proving his point that it makes peak HP at 7,000 rpms.

Any 2.2 turbo or not... makes power at 7,000 rpms. Just not near peak power.