Making redline in a 340 SHP

[Joe C.]

Re: Making redline in a 340 SHP

Listen to a healthy L76:

http://smg.photobucket.com/albums/v216/speedo1952/Joes%20Videos/?action=view&current=2010_06_05-65VetteHeadersVettepacks.mp4

[Stuart F.]

Re: Making redline in a 340 SHP

Duke;

I will take your advice seriously regarding the weak rod situation. The more I think about it, the more I think I should pull the original L-76 and replace it for the fun of driving with a built 383 or something. I want to enjoy it as much as I can with the remaining years I may have to drive it. There is something to be said about showing it as well, and being able to have folks appreciate it's originality.

Stu Fox

[Bob H.]

Re: Making redline in a 340 SHP

Very nice Joe. Just love that screaming sound. The tach doesn't look too healthy though........hehe

[Jim C.]

Re: Making redline in a 340 SHP

Listen to a healthy L76:

http://smg.photobucket.com/albums/v2...Vettepacks.mp4

YEAH BABY!

[Domenic T.]

Re: Making redline in a 340 SHP

Jim,
if it's not broke don't fix it. Just take care of it. when at the drag strips in the mid 60's those engines were beat to death and the boys that couldn't drive. They floated lifters and could blow the best rods made when they kissed the pistons and valves.
Just remember always keep them rods under load when reving. The drive way tune ups at 7000 could put a rod thru a pan the fastest.
STORY,
We made 327's out of our 283's before they came out by boring and stroking threm. One guy (mechanic/racer)couldn't get his engine to run above 6000 and we, the audiance, didn't help matters out by all the free advice and got so mad he put a brick on the gas pedal, we all ran expecting it to blow. I can't describe the noise it made till he gave it to another guy who ran up and turned the key off. The guy never took the engine and a week later the mad man was winning his class. He ran that engine on the street and strip after he found his problem (distributor point float & bad bushings).

DOM

[Bill C.]

Re: Making redline in a 340 SHP

That video !!!!!!!!!! Holy crap .. all I can say.

[Jim C.]

Re: Making redline in a 340 SHP

Jim,
if it's not broke don't fix it. Just take care of it. when at the drag strips in the mid 60's those engines were beat to death and the boys that couldn't drive. They floated lifters and could blow the best rods made when they kissed the pistons and valves.
Just remember always keep them rods under load when reving. The drive way tune ups at 7000 could put a rod thru a pan the fastest.
STORY,
We made 327's out of our 283's before they came out by boring and stroking threm. One guy (mechanic/racer)couldn't get his engine to run above 6000 and we, the audiance, didn't help matters out by all the free advice and got so mad he put a brick on the gas pedal, we all ran expecting it to blow. I can't describe the noise it made till he gave it to another guy who ran up and turned the key off. The guy never took the engine and a week later the mad man was winning his class. He ran that engine on the street and strip after he found his problem (distributor point float & bad bushings).

DOM

Dom, after watching Joe's video seems his winds up a bit faster than mine. I have 3.70 gears and wide ratio M20. Would that make the difference?

Also I have not done my valves in a couple of years, I had been setting them at .08 intake and .18 exhaust.

[William C.]

Re: Making redline in a 340 SHP

Remiinds me of when Carl Strohm and I PV'd my '65 Fuel car many years ago...

[Stuart F.]

Re: Making redline in a 340 SHP

Talk about free reving engines w/o load; the muffler installers at Carlisle were reving every C-5 and 6 until the valves floated just to test the new sounds - WOW!!! At first I thought they were running them on a chassis dyno, but I never heard any shifts. One right after another! Is that crazy or what.

Personally, I think they all sound "tinny" - just my opinion, but then I'm spoiled by my 340 hp L-76. I can't understand why any C-5 or C-6 owner would want one of those aftermarket exhaust system unless it's because they weigh less. They sound terrible, specially for such a beautiful car.

Stu Fox

[Joe C.]

Re: Making redline in a 340 SHP

Stu,

Yesterday afternoon at Carlisle, I drove the '65 from G110 (Vetteheads spot) to the chassis dyno near gate 6 with open headers. You should have seen the crowds gather, the smiles, the thumbs up and the picture/video recorders!
I agree with you. I don't care for the sound of C5-C6 exhaust. But, Jaysus Chrissmus.........they make loads of horsepower!

[John H.]

Re: Making redline in a 340 SHP

Personally, I think they all sound "tinny" - just my opinion, but then I'm spoiled by my 340 hp L-76. I can't understand why any C-5 or C-6 owner would want one of those aftermarket exhaust system unless it's because they weigh less. They sound terrible, specially for such a beautiful car.

Stu Fox

Stu -

The C5/C6 LS engines have a different firing order compared to the previous 45 years of Chevy V-8's - that's why they sound "different" than we're used to hearing.

The "traditional" order was 1-8-4-3-6-5-7-2

The "LS" order is 1-8-7-2-6-5-4-3 (same as the Ford Modular V-8's).

[Stuart F.]

Re: Making redline in a 340 SHP

John;

Thanks for enlightening me about the reason C-5/6's sound as they do with the LS engines. I still don't feel the aftermarket exhaust systems improve that aspect. Power!? yes, they are great.

Joe;

Perhaps, or at least I hope, what I heard was some cars on a chassis dyno, but it sure sounded like a free rev to me, i.e. no shifting or sound of a pull under load, and a rapid deceleration with exhaust rap. It seemed to be coming from the area of the exhaust system installers and I wasn't that far away.

Stu Fox

[Joe C.]

Re: Making redline in a 340 SHP

Stu -

The C5/C6 LS engines have a different firing order compared to the previous 45 years of Chevy V-8's - that's why they sound "different" than we're used to hearing.

The "traditional" order was 1-8-4-3-6-5-7-2

The "LS" order is 1-8-7-2-6-5-4-3 (same as the Ford Modular V-8's).

So they use a flat crank rather than a cruciform. Didn't know that. Much much better exhaust pulse tuning! Wonder how they handle the second order imbalance. They still sound like cr*p.

[Joe C.]

Re: Making redline in a 340 SHP

John;

Joe;

Perhaps, or at least I hope, what I heard was some cars on a chassis dyno, but it sure sounded like a free rev to me, i.e. no shifting or sound of a pull under load, and a rapid deceleration with exhaust rap. It seemed to be coming from the area of the exhaust system installers and I wasn't that far away.

Stu Fox

The chassis dyno was located right next to the 2 big aftermarket exhaust peddlers at the spending frenzy: Borla and DynoMax. I was amazed at the huge PILES of OEM exhaust systems laying on the floor under both tents. The piles were about 4 feet high and 12 feet across! Probably almost zero C5/C6 left with original equipment exhaust systems.

[John H.]

Re: Making redline in a 340 SHP

So they use a flat crank rather than a cruciform. Didn't know that. Much much better exhaust pulse tuning! Wonder how they handle the second order imbalance. They still sound like cr*p.

Joe -

Nope, not a flat crank - Ferrari is the only production V-8 with a flat crank (since 1976).