here is my dyno run at true blue from our corvette dyno day in raleigh NC, thanks to Nathan Plemmons for posting it to the web for me!

 

Looking good Chris
Maybe I nead to send you my car......lol

 

Maybe you just need an LT1 j/k :cheers:

A vette is a vette, some are just faster than others. I hope to get a comprable graph real soon.

 

Nathan,
when i said the porting is straight forward in the LT1 head, I mean it, there is really not alot you can do wrong providing you think about what your doing. i am on the LT4 heads and they are being done the same way i did mine, just ran into one snag that i am hoping to resolve with a little advise from Chris K at speed demon motorsports. He and i agree on porting theory, bigger isn't always better in the case of airflow, luckily my reading prior to my port work enlightened me as i originally was going to open everyhting up as much as possible, as it would have it, an old saying mt barber tells me when i get a haircut, taking more off is not a problem, but putting more back in is! so i figured i would test the high velocity flow dynamics agains a wide open large runner port design. basically i removed obstacles, if there was no obstacle, i simply removed the rough surface and polished them. i mirror finished my runners, bowls, and ports so you could brush your teeth in in their reflection. my theory being that with sequential multi port FI, the injector would not fire until the valve had begun to open, this in turn would fight any puddling that previously plagued old carbuerated head porting. also with the advantage of a high pressure fuel system, the atomization of air and fuel would be nominal in a straight flow air path and would require less turbulence to combine the air fuel mixture rendering a high velocity air flow for excellent torque due to small runner design and higher rpm ability to move air through the same small port due to a less resistive/ turbulent path. fairly simple when you think about it. now i did mine on theory alone, for any of you out there who are affraid of this, i recommend having it done professionally, for those who are not deterred by the idea of possibly but not likely ruining a set of LT1 heads, i am more then willing to answer any of your questions on performing this job. it will save money and cost time, but it will also give you somehting to work on for a while, if your like me sitting idle when there is something to be done on you Vette is not an option :D i am a tinkerer and i like to work on my car with a passion, so, now that i have finishe dmine, i have started my dads, lol oh well, guess i will need more corvettes to play with after this :lol: :lol: :lol:

chris

 

You are right I nead a Vette with LT1 or better yet a LS1......lol

Nathan did your friend with the 95 Z-28 get his car running right if so what was wrong with it?

Jay

 

I haven't actually talked to him about it in a week or so. I'm sure it isn't running or I would know about it. He just got sick of messing with it, I can't say that I blame him. If you sink $10k into a motor just to have it not work, that'll kinda make you mad. It will run, but it'll be whenever he feels like working on it again.

We really needed to get it running for our track event by October 27th. Obviously that didn't happen, so he's not in a big hurry now. I think he knows a guy who can fix it for him, but it will cost some amount of money. My guess is that he'll just pay off some of his debt for a while.

 

Very nice power but, since the A/F didn't change, looks like you may not be going open loop. If that's the case you have a lot more ponies waiting in there.

My recent dyno pulls (on my site) show the A/F going from 14.7:1 to 12.6:1 shortly after the testor went to WOT, indicating open loop mode.

 

65zo1,
Very good Observation! you are dead on, I noticed my O2 mV's boucing all over the place on the data master logs, and then glanced up and saw it was still in closed loop. so i will contact my tuner and find out why I'm not getting open loop under WOT. gotta eb some more power in there somewhere! :D :smash:

chris

 

Almost all scan tools will lie to you at WOT when they report open or closed loop (from the cheap ones to the expensive ones). The best way to tell if you are in open or closed loop at WOT is to see if your BLM's and INT's are locked. -Matt-

 

Nice results for ur hard work and planning Chris....My parts came in from Speed Demon motorsports today..I'll leave them in the box until you show -up. The headeres havent arrived yet but i guess we wont need them for at least another week....i was really impressed with the way my heads looked
when i stopped by,, cant wait to see em when ur finished,,,,,,

 

Yep, lcvette did an awesome job with his. I can't wait till you guys finish with mean, mean, Mr. Green :eek: I'll be there to capture the moment when Papa Chris steps on the rollers and rocks da house :D

Brian

 

lcvette, nice numbers.

from your description, would extrude honing do a similar job. Just polish the surface?

Jim

 

ttt

 

hammer, it would on the port walls if a gasket match was done before hand, but i feel the extrude hone would actually remove too much material. unless they have different guage media they push through for the abrasion process. also, i did quite a bit of fine tune bowl work that the puddy can't do. if extrude honing is all you plan on doing, your better off using cross buffs and 280 grit sandfiong wheels to smooth the surface. this will help some, but the bigger power is made when you get into cleaning up the bowls and reducing the blockage from the valve guide boss and guide itself. this is a terrible hinderance for air to have to get around and it was terribly rough as well. i only recommend polishing on 95 and up cars with the sequential port fuel injection, this is what i based my anti puddling theory on when i decided to polish them completely. if you read you will find that earlier LT engine are batch fire style injection meaning that fuel would have an opportunity to condense to the port walls of the non active ports instead of the fired mist being swept directly into the combustion chamber. if you look at extrude hones page you'll also notice that the cars they describe are cars which have sequential injection and nascar which the claim to use extrude hone sustains high rpm and is carbuerated but the higher rpm creates enough turbulance to keep the mixture blended and also due to the fuel coming from the top of the manifol, it is only pulled into the ports which are feeding open cylinders. plus Jeff Gordon is not concerned with nice Idle quality or 30 MPG around town, its a race car! good luck!

Brian,
Heads are just about done man, finished one last night tonight the other gets polished up and the combustion chambers get some attention, then a thorough CC check and off to the machinist for final prep and machining before we reassemble them and bolt them on, this weekend is mod fest for the green machine, Jeff and Steve and Matt are all gonna come have some brewhas over the assembly of the Shagnasty Green beast! :D getting antsy, all dads goodies are in and man let me tell you, i cleaned my room just to lay all of them out on the floor to look at, what a setup he got, absolutely gorgeous, makes ya feel all warm and fuzzy just thinkin about it!!


gimme a ring this evenin, i am curious as to where you planning has come... and if i hear any talk of R1's or bikes im firing you! ;)

PS.. Car was dropped off yesterday morning! GEars will be in her by tomorrow afternoon! yeeehhhaaaaaawwwww!!! lol

chris


[Modified by lcvette, 8:14 AM 11/8/2001]

 

ncChris he does do a good job, cant wait to see the number that you will have when he is done with your car.

Jay