So hear me out on this one. I've been in quarantine for way too long, drank way too much yesterday, and have a bit too much time and money on my hands because I've been in quarantine too long... but here goes.

Presently I have a healthy amount of work done to my engine. Decent 195 heads, 224/230ish roller cam, full roller rockers, longtubes and dual exhaust with x-pipe, and upped compression to about 10:1 (i say about because measuring the CCs on the stock pistons leaves some accuracy to be desired.... But all that is running through a stock, and I mean untouched since it left the plant in 84, CFI induction setup. Now I have a renegade that is torched... lots of problems that prevent it from working on my engine, most of which was a lot of core shift and machining errors causing vacuum leaks. So I can't run that.

But my thought is this, run this combo on the dyno with a pretty well optimized tune and see what it puts down power wise. (Probably not too impressive) then, port the hell out of the intake and optimize the fueling again and see the power gains on the dyno. Now my thought is this, yea it won't be comparable to how well it would behave on a stock car, but the change in where the peak occurs would be comparable as air flow is air flow.

My thoughts why are as follows: because the thing is so restrictive in stock form, the increase in rpm band on the modded engine would still be present on the stock one. For example, if the stock peak is 4600 rpm for HP and mine is around there too and then after porting it moves to 5200, at the very least the stock engine should be able to realize power out to 5200 as well. It may not be an increase in peak but it is an increase in total area under the curve and usable rpms in performance applications.

I feel as though I can have some fun with this and it would provide useful data too. I'd rather take it to the track but who knows when I'd have the time for that. (Atco is about an hour away)

And it still may correlate decent. Let's say I dyno 270 wheel and then dyno 300 wheel. Thats roughly an 11% change. As long as the stock setup can take advantage of the increased air flow potential to its max, the stock 205hp should see roughly the same increase as the current setup will tax it harder. Now if the stock engine doesn't have the ability to use all the available flow presented after porting, then the change will be lower percentage wise...

I feel as though this is useful enough to be worth documenting and if I ever get my hands on a good renegade I could compare that too. I could also do it in stages like first test stock. Then pop out the swirl plates and then do the whole ported deal to see what each does... Thoughts? (Yes I have been drinking again)

 

You spent all that time and money on the engine, and then bolted on a stock CFI intake manifold? You have been drinking too much!!

 

And then you can do an x-xfire experiment with a dual plane intake and carb set up!!!

 

If you are going to do it, might as well get data if you have ready access to a dyno.

 

That experiment has already been done, and the results are in: DUMB.

OP, Definitely do it. It's data, it would be some of the more disciplined data collect on a CFI car as most is totally SOTP, I think it would be great to see. There is some data out there on the Renegade on engines similar to yours,so would be cool to see the comparison on a modded engine, IMO.

Port it until you start to "hole" the walls floor and ceilings. Fix w/ epoxy. Port the bejeezus out of it!

I love it. Keep drinking!

 

Yea. Well originally I was talking with Tom (Buccaneer) and we had thought that I would have had a working renegade by now. The stock intake was originally just to get it back to my house, I don't have the room for that kind of work in my garage but my aunt does. But they also needed it to get construction underway too. I was afraid of tearing up my stock intake too. Having a backup helps.
An eddy performer doesn't seal on these heads. Port is too small. I tried just for fun for a friend looking at those heads and I do have a 650 and a rpm intake. It would need a victor JR or similar to work.
East coast supercharging is 20 minutes away and the pulls are cheap. Plus its a hub dyno.
I'm going for the best I can do. Its different but like I said, should scale.

 

Do you need a spare intake?

 

I was expecting crossfire in a shootout.

 

There is a guy like 5 minutes away with a 3rd gen graveyard. I shot him a message seeing if he had any. For 50$ it's mine.

Now if you happen to have a worked over one you just want me to test I would be down for that. I'll send you some collateral if you like... and maybe some homebrew. Otherwise I don't see the benefit of shipping it out as just a spare. Knowing you, I know you probably have something planned for that in the future.

 

HAD something planned. You' were right. But that time/plan has come and gone, unfortunately. IDK...Sometimes I think about throwing it on the Kart for the oddity/looks, but I won't ever do it.

 

I was going to port it but haven't yet...or never did. It's a plain-Jane stocker.

 

I'll let you know if this guy gets back to me.

 

 

You and I both know yours will make the most. But I am curious if the curves are gonna move around. you know, for science.

 

i have my original cfi intake in my garage.
So far i have used it to test out my bead basting cabinet.
Pressure was a tad to high, but it's clean!
(ran cabinet at 100psi. now i run it at 40psi)

Been thinking about melting it down to try molding some random things (i have a little kiln in my garage)

I could do a rough (probably drunken) porting on it and donate it... :

 

I'll gladly pay for it. I'll get drunk and port mine and see who's dynos higher.

I half want to cut open the underside and plug up the water passages from underneath to better get at the ports should I punch through....

 

You are correct about mine and it will make the most at mid and high end when the motor will want a ton of air. I say, go for it and see what it will do and collect the data. The water jacket will be the limiting factor for sure on a stock unit. BTW, I did hear from one foundry today and the numbers were rather disappointing, way too high. One more to go.

 

Eddy?

And yea. I am expecting the power peak around 5800 and it to carry the peak into the low to mid 6000 range once sorted. The cam specs support that. The heads are overkill for that being a 195, they would be more than adequate for a 383 spinning that high imo. Even a ported and brazed stock unit i don't think will be adequate as far as seeing the full potential of my setup. Worst case I have to start trying to fix my foobar renegade.

I think you'd be surprised about the low end power. If the heads are capable of good port vepotty and the engine is taking advantage of tge flow characteristics of the intake I would suspect that it would be down slightly but overall have way more area under the curve. Case in point, when it did work on mine, I didn't feel like I lost a ton of power on the bottom with the stock stuff. It just felt better elsewhere so it seemed slower.

I will as everyone what they think it'll dyno in each iteration. I personally think as it sits it'll dyno 295 wheel. Ported it'll dyno 332 and woth the renegade it should be in the 350 range. Now knowing what the combination makes on other setups, it has the potential to be in the upper 300 range but I just don't think I can tune it that well and I still think there is some power left on the table even with the renegade. However I feel that it is obviously designed to be as best it can be and fit as it does. There just isn't really anything left to tweak because of space constraints no? Sorry. Just thinking out loud. I'm excited.

 

Update: have an intake in hand. Its about to get real as the amount of epoxy I just ordered is mind boggling.

 

Heck yeah! Pics!!