Pushing the 2.7? What to do? Suggestions, Experiences, Theorys... Anything... - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 8 (permalink) Old 11-11-2006, 12:24 AM Thread Starter
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Pushing the 2.7? What to do? Suggestions, Experiences, Theorys... Anything...

Ya 2.7, bad design, sludge, blah blah.... no whining in this thread ok?

If you go back to old school measurements a 2.7 equals close to 165 cubic inches (164.764108359 cubic inches to be exact)

That is 1.21 HP per cubic inch, which would be a good accomplishment for someone with say a 318, which, with this ratio would be making 384 HP.

Now say you had a 318 with 384 HP, what would be left to do? Unless you were going to throw a supercharger or NOS on there, or a really big cam that you couldn't drive on the street, you're pretty much done, but with the 2.7, your just at the beginning.... Chrysler seems to have took all the fun out of this eh?

1 HP per Cubic Inch is the goal of many people, but stock, this engine surpasses that mark, yet you hear cries of shitty performance?? What are you asking of a 165 ci engine???

Anyways, this thread is for the goal of improvement...

*My first mod of this nature will be to change my '98 Intake to a '00 intake with MTV (manifold tuning valve). This should pretty much be the same as if you had both a high rise and a stock intake on an old school engine, only you have electronic control to switch between the two, via an '00 or '01 PCM that can control the MTV. Sure you only gain 1 HP at peak, but in the low-midrange you will gain quite a bit compared to that stock set-up (10-20 HP on the dyno curve?), and there is probably some fuel economy improvements there to.

Now for the questions, are any of these options feasible, worth it, good
experimentation?...

* Porting... Port match upper and lower intake, throttle body to upper intake, lower intake to heads.... since I'm switching intakes, this would be convenient...and I'm going to do it anyways, unless there is nothing to grind away...

* Increase rocker arm ratio... like in the old days of changing out some 1.5 rocker arms to 1.6 to get more valve lift. This would require custom rocker arms. I may buy a set of 2.7 heads off a blown 2.7 to play with to see what can be done, which would allow me to check out the porting options of the heads also. I have a friend that is a machinist that could probably make a set.

* 3.5 PCM? Since the 2.7 PCM will run a 3.5 in the engine swap scenarios, what would a 3.5 PCM do for a 2.7? I have no idea..... but if you made mods for more air, the 3.5 PCM could deliver more fuel for you is what I would think...? Also prety much any Dodge PCM will plug into the Trep, so what are the fuel curves, timing, etc on all those engines?

* Cam Regrind.. Now this is out of my price range, but it could be done... lower the base circle to increase lift, alter valve timing, duration....

Again, Chrysler really left no room for improvement IMO, but mabey there is?
Getting 1.21 hp/ci is pretty good, did they leave anything out?


Ideas?
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post #2 of 8 (permalink) Old 11-11-2006, 01:18 AM
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As for PCM, a 3.5 HO PCM may work, but I'd call B&G Chrysler (details on some other thread....) and see what they can do. The 3.5 HO has TWO manifold tuning devices, a short runner valve and a manifold tuning valve, it is a tri length plenum.

The best gains are probably in a custom PCM with an MTV equipped plenum and in cams. While your messing with the head, you might look at ways to improve oil flow to cope with the extra load.

I think it MAY be possible to get this thing up to the next mechanical holy grail: 100bhp/litre! Synthetic oil will be a must

2004 300M Special...257K miles. Original powertrain!
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post #3 of 8 (permalink) Old 11-11-2006, 01:34 AM
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I'm interested in this, I'd like to see the end results, well, when it does get done.
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post #4 of 8 (permalink) Old 11-11-2006, 02:30 AM
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I'd add some fart cans and maybe one of those super turbo vortex exhaust tips. Don't stop there and add some stickers and maybe one of those super turbo vortex intake swirl optimizers.
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post #5 of 8 (permalink) Old 11-11-2006, 05:17 AM
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Quote:
Originally Posted by Ronbo
I'd add some fart cans and maybe one of those super turbo vortex exhaust tips. Don't stop there and add some stickers and maybe one of those super turbo vortex intake swirl optimizers.
Dude you forgot the most important mods! Plastic spinner hubcaps! japanese lettering and Type R stickers!!
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post #6 of 8 (permalink) Old 11-11-2006, 10:19 AM Thread Starter
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Wow, it only took 2 hours for this thread to get fucked up, thanks guys.
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post #7 of 8 (permalink) Old 11-11-2006, 10:37 AM
 
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Quote:
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Wow, it only took 2 hours for this thread to get fucked up, thanks guys.
Don't worry your's is a legitimate question, but as far as I'm concerned the 2.7 it's probably at it's peak keeping in mind the HP/longevity ratio, maybe a little too tweaked for an engine that size wich as we know leads to premature failure in some cases (not in mine yet thank GOD). Maybe by replacing internals for higher quality ones and addressing the sludge problem by using only the best synthetis oils one could always try the "boost" route and i think a supercharger would be the best for an already hot running engine instead of a turbocharger. The good thing about the 2.7 is that we still have some room in our engine bay to do that whereas 3.2-5's lack that .
So the best way to up the HP on a 2.7 would be to rebuild it first so you won't have to worry about it falling apart on you in 100 mi and then figure out a mild boost setup for it .
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post #8 of 8 (permalink) Old 11-12-2006, 10:13 PM
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A supercharger may be the ticket.

Add the MTV plenum and PCM and a BIG ASS oil cooler, one for an RV!

You will probably want every reinforced part made, especially the bearings. The timing chain, chain guides and tensioner should be replaced as a set when rebuilding in all cases, ether for performance or grandma!

When rebuilding the transaxle, keep in mind that Raybestos Powertrain makes Kevlar clutch packs for the 42LE.
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