View Poll Results: Have you ever lost #7???
Yes
81
29.45%
No
194
70.55%
Voters: 275. You may not vote on this poll
How many of you guys have lost number 7....
11-08-2006 | 01:09 PM
#61
Originally Posted by JL ws-6
that's been tried, doesn't make a differnece. The only real thing that can be done is to go to the single plane intake, so all cylinders are getting the same amount of air. But, most people aren't willing to hack the cowl/hood to get it on there, as well as all the other things that have to be done.... so the only real thing to do is stop pushing the stock shortblock so hard.... or at least keep the tune more towards the safe side. Won't put up the #'s that everyone gets so hard over.. but if you can't afford to replace the shortblock, then you shouldn't eb racing anyway, so power #'s shouldn't really matter that much.
What it does do is that it allows more hot coolant to escape the rear of the block. This can't be a bad thing & I wouldn't say that in all cases it doesn't make a difference. Agreed that if 7 & 8 are too lean, more cooling isn't gonna save the cylinder. Personally, I'd never not tie the rear head passages to the radiator.
Would agree that the intake swap you mention is the best solution to the lean condition problem & I'd tie the rear coolant passages to the radiator along w/ the intake swap.
11-08-2006 | 07:20 PM
#62
TECH Regular
Joined: Dec 2004
Posts: 408
Likes: 0
From: Hoover, AL
damn how common is this ****? i beat the hell outta my car on a daily basis and never had anything happen to it. it seems that the spray or blown cars seem to be the ones doing it though. i never heard about this problem before.
11-24-2006 | 11:47 PM
#64
The know it all's know it all
Joined: Oct 2006
Posts: 500
Likes: 0
Originally Posted by Tony Mamo @ AFR
Losing #7 before you post dyno results would certainly suck (and probably be a first)....hopefully thats not the case.
I lost a small piece of my #7 ring land with my stock short (52k on the clock), but considering the handful of nitrous bottles ran thru it, many late night blasts on the street (and some track time), over 400 logged chassis dyno runs, and the fact I shifted it for a year at 7K (with the AFR headed combo), Im thinking why didn't it fail long before that.
I speculate that I might have slightly hurt it (the ring land) on a spray pass, quite some time before it actually failed in the car, but who the hell knows. One thing for sure is that shortblock was a good one and didn't owe me a dime.
Bottom line however is that alot of engine builders and tuners feel that the rear two cylinders get the most air due to the layout of the intake, with #7 probably the worst offender. I dont have conclusive facts to back that up and look foward to hearing from others who might have looked into that situation a little more closely.
Tony
I lost a small piece of my #7 ring land with my stock short (52k on the clock), but considering the handful of nitrous bottles ran thru it, many late night blasts on the street (and some track time), over 400 logged chassis dyno runs, and the fact I shifted it for a year at 7K (with the AFR headed combo), Im thinking why didn't it fail long before that.
I speculate that I might have slightly hurt it (the ring land) on a spray pass, quite some time before it actually failed in the car, but who the hell knows. One thing for sure is that shortblock was a good one and didn't owe me a dime.
Bottom line however is that alot of engine builders and tuners feel that the rear two cylinders get the most air due to the layout of the intake, with #7 probably the worst offender. I dont have conclusive facts to back that up and look foward to hearing from others who might have looked into that situation a little more closely.
Tony
Multec injected 4cylinders have had massive issues with this due to the injector design. you will often find the injector at the end of the rail if its not a flow through clogs first.
01-04-2007 | 03:37 PM
#69
The 2JZ and the 4G63 like to loose the last piston in the intake manifold as well. I think it's just the leanest cylinder on any design. My injectors were flow matched. I put the 2 that flowed the most, in the back to holes. I doubt that will help much but it's something 
01-06-2007 | 11:34 PM
#70
I lost #7 to water...new dip in the road I hadn't been down in yrs and the dip was so bad the water cam to the top of my rocker panels, no wind so it looked like the road, at 2am lol...sucked but it bought me a FFHP Forged 347 :-D
it broke #7 in half, flipped it upside down and smashed it into the sleeve. the other half was in pieces laying in my oil pan. the other chambers had dirt, grass and bugs in them...yes, it was alot of water. oh, I also have the free ram air mod.
it broke #7 in half, flipped it upside down and smashed it into the sleeve. the other half was in pieces laying in my oil pan. the other chambers had dirt, grass and bugs in them...yes, it was alot of water. oh, I also have the free ram air mod.
01-07-2007 | 05:30 AM
#72
Well I actually lost 1,3,5, and 7. Stock bottom end H/C blower. Blower locked up bad bearing on it. the pictures of the pistons are in my signature. I drove it like that for about two months before it got too bad to drive. Ran an2.4 60' 11.51ET @ 128.9MPH with these postons and Goodyear F1's so it still ran pretty good lol!
01-08-2007 | 01:12 AM
#74
Forged internals will help because they are just stronger in general.
This is why I want to go direct port with the nitrous and I'll jet #7 and maybe #8 just a tad bit richer than the rest.
This is why I want to go direct port with the nitrous and I'll jet #7 and maybe #8 just a tad bit richer than the rest.
01-17-2007 | 12:25 AM
#75
Banned
Joined: Apr 2006
Posts: 48
Likes: 0
i lost my seven on my stock short block with heads, cam, and BBK SSI intake manifold..... my problem was i maxed out my stock injectors and was running pretty lean, and did 153 down my street one saturday 
im stroked and forged now.................
im stroked and forged now.................
01-17-2007 | 08:33 AM
#76
Launching!
Joined: Aug 2005
Posts: 211
Likes: 1
From: East Central Florida
I havent lost it, but I have had so much trash buildup at the end of the fuel rail, its a wonder that #7 injector still functions. I run a cylinder balance test on HP tuners every few months on my ss and avalanche to see how bad #7 gets. I hate pulling the fuel rail to see that crap in there. Orlando gas must flow down **** creek at some point on its journey. I reccomend cleaning the rail above #7 as routine maintanence.
01-17-2007 | 08:24 PM
#77
First I've heard of the cylinder balance test in HPT. Learn something new everyday, fired up the scanner and there it is. May have to wonder down to the garage and test out this new toy. Getting ready to put the LS6 intake on anyway. Guess I'll take time to check and clean out the fuel rail. Good info!
