4g61t.org

lol you gonna give her an australian kiss before you leave?

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I own a CSM.
I live my life 1 repair at a time.
Nothing matters...not my crew...my bills, nor my friends drama...
For those 10 months or less... I'm broke...

Bill, my 61t head has been ported matched to a 1g turbo intake mani.
i'll use paint to illustrate what type of design i'm going for... i'm going to get him to engrave something in it also... just dont knwo yet.
If i do make it. I'll dyno it for sure and tell you my results and if you are interested i can replicate it no problem.
I was just going to take the stock 1g intake mani, cut the flange off and use it as a phenloic spacer (i know i'm cheating) replicate the flange, and bend some tubes to match the port and just put a "end tank" on it to mount the TB.
I dont think it will cost me alot... since he really likes me

Also, the ADJ Cam Gears... it may be tricky...extremely tricky.
I know he can do it but i just dont want to take responsibility for someone advancing/retarding the timing to much and revving it up and BAM have the valve's kiss the piston and cause some serious damage.

-Dominik

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92' Dodge Colt 200GT - 4G63T - Taking Offers.

It seemed to me that the 4g61 block aligns well to the 2 gen intake, but the 1 gen port is larger and more square. I know that the head intake ports could be enlarged (a bit tricky beyond the flange), but the runner would quickly reduce to the head original size quickly beyond the opening port. "porting"is supposed to enlarge (or reduce) gradually to permit more volume and smooth transition. Also, the xx63 has longer runners. Our conclusion, (not supported by document or antecdote) was to just stick with the xx61 until someone showed o reliable improvement that permitted street driveability as well as ultimate top end. No, we didn't do any flow test. (Don't know how.) Still curious. Bill

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Age is a number; attitude counts.

i have to much free time


http://www34.brinkster.com/minievo/intakeideas.html

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92' Dodge Colt 200GT - 4G63T - Taking Offers.

Hopefully i did this right. These are screen captures of the dyno simulation i ran on cam timing variations. Should be pretty close to a stock 8 valve 4g15. If its only close, you still can see the benefits of cam timing.

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http://members.cardomain.com/socrateez
04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t

I did somethimg wrong and the pics didnt show up. I'll figure out what i did wrong.

_________________
http://members.cardomain.com/socrateez
04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t

email me the pics and i can post them on my website.
coltevo@hotmail.com

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92' Dodge Colt 200GT - 4G63T - Taking Offers.

I just emailed those pics to you! Hope they go through!

_________________
http://members.cardomain.com/socrateez
04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t

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92' Dodge Colt 200GT - 4G63T - Taking Offers.

And the plenum volume should be 50-70% of the engine capacity (seems like the range is too much to be really meaningful except for outside parameters). Plenum-to-runner intersection should have a "bell-shape" curve to the runner. The curve into the runner should equal the radius of an arc of the diameter of the runner throat at max. velocity point; and each runner should have an area in the plenum dedicated to it equal to 3d. (d=runner throat) Runner should taper to increase velocity to combustion chamber. Length of runner would be longer for low end operation and shorter for high end. (No other info.) from: Maximum Boost: Designing, Testing, and Installing Turbocharger Systems by Corky Bell

_________________
Age is a number; attitude counts.

that brought up a stock 4g15 8v to what...96hp and the torque up to around 94 ft-lbs also.....would i have to run factory set timing to get this increase?

_________________
I own a CSM.
I live my life 1 repair at a time.
Nothing matters...not my crew...my bills, nor my friends drama...
For those 10 months or less... I'm broke...

Since the distributor runs off the cam you have to change the ignition timing. It'll be like 9* off. I was like oh crap were did my timing mark go! Just crank her all the way. If it wont time in, you'll have to modify the adjustment slots like i did.
Those horse power and torque figures are probally a few hp high to begin with since thats what they differ from book specs. But then again Chiltons figures have fine print that states;
Figures are with all accessories running and are representative rather than actual.
So who knows, the sim may be more correct I spent a lot of time going through the manual to set up the parameters as close as possible.

_________________
http://members.cardomain.com/socrateez
04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t

Thanx a bunch for postin the pics colt-r!
I'm working on simulating the 12 valve engine as well. The software doesnt do 12 valve engines so i'm working with an 8 valve with the intake valve area reflecting the combined area of the 12 valve. Wont be perfect but should give ball park figures. The software is at least useful to see what sort results can be expected from different mods. It's fun to play with too.

_________________
http://members.cardomain.com/socrateez
04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t

Colt-r, that dyno plot was generated artificially correct? If not I'd like to see the 4G15 that revs to 10k rpm!

I tried a couple things I call a poor mans cam upgrade. I) I went from a '90 exhaust cam to a '91 "C" cam. 2) 9 degrees retard on the E. seemed too much, so I went 4 deg. back. I measured the OEM relationship between the dowel pin hole and the timing mark. I think it was 86 deg. This was done on a circular table on a vertical mill. I then designated a new timing mark about 45 deg. from the OEM mark. From that mark I turned the cam gear 90 deg. and drilled a new hole for the cam's dowel pin. Anyway I ended up 4 deg. retarded.
I can't say what this did for my engine because there were a lot of changes made over the winter. I can say it runs pretty good though. So far 12.2-12.4 at 116 to 118 on a small 16G in my '89 Mirage.