Garage Storage Organization and Garage Cabinets

22dodge · 08-02-2005, 09:33 AM

The worst I have found was 3° on the 2.2/2.5. on a ford, gm, and even a mopar V-8 I have found the timing mark on the harmonic balancer off by over 20° due to the rubber bond on the balancer failing and the ring shifted.

The S is Silent · 08-02-2005, 10:33 AM

Thanks. 3° error on the crank will turn into 6° on the cam, right?

89acclaim · 08-02-2005, 11:15 AM

RPMurph are you looking into using a G-head or a swirl head? 22dodge how much would you recommend for a maximum to mill either head? Thanks for your time.

Daniel Merrill

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22dodge · 08-02-2005, 11:39 AM

I regularly milled the heads over .120" and decked the blocks .040-060" depending on piston to deck height. I like to have the pistons out .030"... but then I run my engines in the range of 13-14½:1 compression ratio

RPMurph · 08-02-2005, 03:03 PM

im looking into using whatever head is on my car right now......

RPMurph · 08-02-2005, 08:29 PM

.....the question still remains...how far do i go? how far should i mill it? if i mill ir 0.120" will that interfere with my pistons any if my timing belt goes out? do you know of a shorter belt i can use? would that be too much to run on premium fuel?

22dodge · 08-02-2005, 09:00 PM

that's up to you to determine. .120 will get you near 12½:1 using the 782 head. I don't know about valve interference with the stock cam... but so what, in 20 years of racing 4cyl... I NEVER broke a timing belt on my race engines turning 8500+, dual valve springs, .596" lift cams and all were interference... breaking rod bolts was the most common failure.

I took a 1985 cargo caravan, milled the head .040 and gained enough power to spank a 1988 2.2 TBI stick omni... what's the big deal about beating a tbi omni... the van weighs 1000# more, has and automatic and carburated.. stock, the omni whipped the van, just .040 off the head, 3° advance on the cam, base timing @ 16° on 93 octane.... it really pulled...

yes you need a shorter timing belt...MP use to list one. however with some intellegence you can find a cheaper version using a gates catalog. and som cross referencing...

RPMurph · 08-02-2005, 10:13 PM

i know i have a timing belt catalog at work...ill check it out and see if i can turn up anything.....
right now 0.120 sounds pretty good...would i be risking anything by taking it down this far? like would all that compression cause some peticular part to prematurally break? cause i need this to be a reliable car.....i dont mind a lil bit extra wear but i dont want to be putting it up on the lift every week......

The S is Silent · 08-02-2005, 10:40 PM

Quote:

Originally Posted by RPMurph

i know i have a timing belt catalog at work...ill check it out and see if i can turn up anything.....
right now 0.120 sounds pretty good...would i be risking anything by taking it down this far? like would all that compression cause some peticular part to prematurally break? cause i need this to be a reliable car.....i dont mind a lil bit extra wear but i dont want to be putting it up on the lift every week......

I think 12½:1 is a little high for pump gas and a daily driver unless you are using a cam with a lot of overlap to help bleed some of the extra pressure off.

RPMurph · 08-02-2005, 10:44 PM

like a turbo cam maybe?

22dodge · 08-03-2005, 07:58 AM

NO turbo cams have the WRONG profile for NA engines.

89acclaim · 08-03-2005, 08:07 AM

If you are going to still use the factory TBI setup and not convert to carb or a standalone setup I would say increasing a point maybe a little more. The TBI is choking the engine. You could use the 88 2.2 cam to bleed off some compression if worst came to worst. 22dodge have you had experience of using a milled G-head on a relatively stock tbi 2.5?

Daniel Merrill

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22dodge · 08-03-2005, 08:12 AM

yes I have... it works great. infact the air flow at high RPM is SUPERIOR to those crappy swirl heads.

89acclaim · 08-03-2005, 08:57 AM

22dodge how important have you found quench on the NA engines that you have made? On the 2.5 with the G head did you change anything with the spark?
Daniel Merrill

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22dodge · 08-03-2005, 09:23 AM

I ran flat top pistons in my 2.5 with a milled 287 head, big valves, .550 MP cam, solid lash adjusters, I also use a VW ignition system with max advance set at 38°.