You have to be able to move the air (intake and exhaust) and fuel fast enough to make use of those higher RPM's.

Like intense said, their VVT/VTEC allows them to do so.

Our engine, at 9K rpms, would likely fall on its face...If it didn't self destruct long before then.

SQ

 

well that's not proven but the vibration might be a tad harsh? Anyways I think Bosch software reflash only allows us to go to 7,000 rpm.

 

That's what I mean - the engine is not designed/balanced to turn 9,000 rpm. It probably wouldn't be pretty, especially if it was for any extended amount of time.

To make use of 9,000 RPM on our engines, the cams and valvetrain would have to be re-designed and the whole thing would require balancing and possibly better hardware, hardened parts, etc.

Believe it or not though, a v6 is usually smoother than an inline 4 (from what I've experienced at least).

High N/A power on these cars is probably going to be like most other push rod cars - rough idle and not very street friendly.

SQ

 

True, but that doesn't mean we can't rev to 7,000 rpm. (Okay, maybe 6,500 rpm keeping the engine more reliable). It shouldn't put that much more stress on the stock internals (at least not 500 rpm). The thing is, if our camshafts are designed to make power up there or will it just drop?

 

The Original S2000 while it was a great sports car is wasn't that great to drive under normal conditions on the road. It had very little torque and power was way up in the revs. Honda latter changed the engine to give it more low end performance which also resulted in a lower redline. I think they increased the stroke but can't remember.

Our engines should be able to go to 10.5 - 11.0 : 1 compression on pump gas. What is the stock compression? Cams can be re-ground, and a true header wouldn't hurt either. Then just in case you need more you can always add a Nitrous system for an additional 150 HP when that Z06 pulls up next to you.

 

https://www.crossfireforum.org/forum...ead.php?t=7332

True about the S2000, but then again it was very light and didn't really need any more torque (trust me I daily drove one for 2 years).

SO! Revving to 7,000 rpm is possible in our engines? (that would probably yield a solid 15-20 hp with all the other mods! (intake exhaust tuning etc).

And yea, anyone know our stock compression? (that would also yield about 10 more hp if we could get it to around 12.0:1 or 12.5:1).

 

At that compression ratio you are no longer running on pump gas.

 

You can run up to 12:5.1 on 93 octane gas, but that is the super border line.

Though, with meth/water injection you can run that safely...

 

The limited crossfire is already at 10.5:1 CR
If I could find the time, and build another motor, I would go 12:1 and run on 100 octane and reflash with bosch ecu. Though it would be fun to try 14:1 but it will need a new design on the piston. Add to that Mercedes overbore sleeve you'll have a hi-compression 3.7 Liter. I found a M320 motor for $400 on the net, it's just too good to pass up.

My only worry is will I be able to crank over the engine at 12:1 or 14:1 CR with the stock starter??

 

My LA Sleeve catalogue just arrived today, turns out they make a 90mm sleeve for the 3.2
I'll call them and see if they can make the 96.8mm bore sleeve. Now I just need to find a donor block. I wonder if its possible to go out to 100mm that should get close to 4.0, otherwise I'll be honing like a mad man!

Next step is finding a local piston manufacture, any suggestions?

 

I think you might have a few more problems to solve - a high power gel battery might help or if it's a manual get a push start, like they did with old racing cars (and bikes) that wouldn't start because of compression!

 

Well I'm not even close to worrying about that. I really need to find another block first, so we can start taking measurements for sleeves. Found one on ebay cheap but I would like to inspect first. I found a couple benz yards in town so I'll have to take a peek over there and see what's available.

 

Hey,
New to the forum, haven't read anyone write about the fact that AMG SLK produces 115 more hp than the de-tuned SRT6. Why not use existing AMG pulleys, exhaust, ECU, and the taller AMG Gear ratio?

 

what are you talking about what AMG SLK produces 115 hp more than the de-tuned srt-6... the slk32 rated number is 349 and the srt-6 is 330... but i believe it is underrated and not "de-tuned"...