Fast intakes causing # 7 cylinder failure ??
We just completed back to back tests of 3 different stock rails, same set of injs, same PCM, same pump,,,Found NO difference in flow between 1 and 7.[Or any other inj, for that matter.] Might be a different case if the injs are dirty w/ the crap Jimmy is mentioning.. A clean system worked perfectly.
The test bench:
ASNU inj bench, stabilized power sources, modded G-van PCM, LS1 injectors that I had previously cleaned and flowed.
More to come...
The test bench:
ASNU inj bench, stabilized power sources, modded G-van PCM, LS1 injectors that I had previously cleaned and flowed.
More to come...
Staging Lane
Joined: Oct 2004
Posts: 66
Likes: 0
From: South Carolina
I have seen 2 engines in the past month with this problem. Both running fast 92 with fast throttle bodies and trick flow heads. One forged bottom end and the other stock. Built and tuned at different shops, but both have the same problem. Also both engines broke exhaust rocker arm on cylinder 7 and were not over reved. I am leaning toward a flaw in the fast intake. maybe it sends too much air to cylinder 7 and makes it run lean? No doubt that the FAST intake makes power, but I would much rather have reliability than a extra 10-15 hp.
I have seen two do this myself on the same cylinder. I have been running the **** out of mine with a 90/90, H/C setup on a 98 stock bottom(96K) with dang near 12:1 on pump gas with no failure ?? But mine is ported so that could make a diff. in the air flow to #7 ? I do have my coolant blocked off in the back as well. I like hearing everyone's opinion on this as well . It has me thinking if it is a cooling problem, mine has a 160 thermo in it and will not break 185 degree's on the hottest day in the summer ... Is this possibly why mine has lived so long ?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
This issue is address in Will Hanzel's How to Build LS1/6 engines book. And yes he claims it is due to the cooling crossover being removed. You can modify the underside of an LS6 intake and push down the tubes to work, but those with a FAST intake have almost ZERO room to fit an LS1 style crossover tube.
Like SOMbitch said, if you have flow matched injectors you can compensate by putting the highest flowing ones in the rear cylinders.
Anyone have any bright ideas for how to run a crossover tube from the front to the rear on a FAST intake? Anyone done this, pics?
Like SOMbitch said, if you have flow matched injectors you can compensate by putting the highest flowing ones in the rear cylinders.
Anyone have any bright ideas for how to run a crossover tube from the front to the rear on a FAST intake? Anyone done this, pics?
This issue is address in Will Hanzel's How to Build LS1/6 engines book. And yes he claims it is due to the cooling crossover being removed. You can modify the underside of an LS6 intake and push down the tubes to work, but those with a FAST intake have almost ZERO room to fit an LS1 style crossover tube.
Like SOMbitch said, if you have flow matched injectors you can compensate by putting the highest flowing ones in the rear cylinders.
Anyone have any bright ideas for how to run a crossover tube from the front to the rear on a FAST intake? Anyone done this, pics?
Like SOMbitch said, if you have flow matched injectors you can compensate by putting the highest flowing ones in the rear cylinders.
Anyone have any bright ideas for how to run a crossover tube from the front to the rear on a FAST intake? Anyone done this, pics?
And I'm spraying on top of that, so I figure if this was an issue...my motor would have been toast awhile ago.
