01 ss afr 205 and 224/228 dyno results
02-01-2011, 04:49 AM
#22
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Stock rockers. On the h/c he said under 7k. But after this happening I'm sure there's more secrets and info not correct than I thought. Chance u take buying a used modded car.
02-01-2011, 09:39 AM
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Well right now threw lts, ory and an slp dual/dual it barely sounds like a cam at all. Hopefully I can figure it out and fix it all in one wack. I'm guessing it's a lifter
02-01-2011, 11:55 AM
#28
If the previous owner was to cheap to change out the 92K mile lifters, chances are the p/rods are stock too. Especially if he couldnt tell you what they were. You dont have to pull the heads to check the p/rods. Just pull of the valve covers and rocker assembly. But if it were me I'd pull the heads and replace the lifters with some LS7's just to be safe. Cheap insurance
02-01-2011, 05:19 PM
#29
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yeah i already ordered some ls7 lifters ls2 trays and head gaskets to make sure i just hope the bottom end isnt hurt and the heads are good..lol
02-01-2011, 06:42 PM
#31
When I had this issue the car came to me for an idle issue and the owner wanted a couple pulls on the dyno. It was a 6spd, 10 bolt f-body with 32k miles, 12k on the h/c setup and the car made 361 on my mustang dyno. Compression tested the drivers side bank, cylinder 1 was in the 170's and the rest were under 160. It turned out that the heads were trash and needed to be completely rebuilt, the only reuseable parts were the castings themselves. Runout measured as bad as 17 thou. We fixed the heads, stuck a blower on it, and made 550 on the stock bottom end with a safe tune and out of rpm, power was still climbing hard.
02-01-2011, 07:05 PM
#32
learn how to do a leak down before the heads come off..if you hear air coming from the oil fill tube your rings are bad.if you hear air coming from the intake you intake valves aren't sealing..if you hear air coming from your exhaust pipe ,your exhaust valves aren't sealing.get a compcam trunnion bearing upgrade kit also .check the swipe pattern on the tip of the valve .it should be in the middle .if not you need new push rods.
02-01-2011, 08:17 PM
#33
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thanks guys we plan on taking steps at pin pointing the issue i just went ahead and got the gaskets and lifters since there 92k mile lifters and it would be smart to replace them while were in there
02-01-2011, 08:19 PM
#34
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When I had this issue the car came to me for an idle issue and the owner wanted a couple pulls on the dyno. It was a 6spd, 10 bolt f-body with 32k miles, 12k on the h/c setup and the car made 361 on my mustang dyno. Compression tested the drivers side bank, cylinder 1 was in the 170's and the rest were under 160. It turned out that the heads were trash and needed to be completely rebuilt, the only reuseable parts were the castings themselves. Runout measured as bad as 17 thou. We fixed the heads, stuck a blower on it, and made 550 on the stock bottom end with a safe tune and out of rpm, power was still climbing hard.
02-02-2011, 09:09 AM
#36
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Yeah I know. The local performance shop pulled two rockers and checked them and said everything looked normal but there's no telling what the others could look like. Were def going to pull it all apart and check for abnormal wear just for cheap insurance that it was done right.
Do y'all think while the heads are off I should mill the heads to 59cc ?
Do y'all think while the heads are off I should mill the heads to 59cc ?
02-02-2011, 11:14 AM
#37
Mine are milled to 60cc and then Tony worked the combustion chambers to unshroud the valves so in the end I have 62cc. However, when I measured PTV with Cometic 0.040" gaskets (and the cam was degreed) my intake clearance was 0.069" as I recall. All things being equal you will have less, however it is the intake and not the exhaust. As I recall, the exhaust had plenty of clearance.
Last edited by vettenuts; 02-02-2011 at 07:11 PM.
02-02-2011, 11:23 AM
#38
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Yeah but I'm running stock layered head gaskets. Would the benefit of me milling them be worth the money and effort? What kinda gains do u see by doing so over not
02-02-2011, 01:35 PM
#39
And what are the two common denominators in both situations??
Customers buying used unknown merchandise....buyer beware folks....buying second hand always comes with it's risks as others have touched on.
Not to mention who knows what the issue is here? (heads, bad tune, bad shortblock, an unknown parasite in the driveline....could be a zillion things).
The last situation we all read about, even the numbers that were supposedly "disappointing" were good IMO with 450+ to the tire and a 220's cam not optimized/spec'ed properly for AFR's, unported FAST and unported TB, etc. We just make it alot better dialing in the combo turning an "OK" combination it into an above average performer with a much stronger power curve from bottom to top.
Anyway....thought this situation needed to be touched on quickly
I have spoken with the OP numerous times thru PM's and suggested starting at the basics with leak down and compression checks etc.
Also....In the event the gaskets you ordered were stock (already leaving some performance on the table), you need to run an .040 thick set of gaskets and mill the heads to 61 cc's assuming 92 or better octane. Same CR as 59 and a stock thickness gasket but yielding a better (tighter) "quench" which helps prevent detonation and pockets of unburnt fuel costing you some precious HP and TQ.
Its ALL about the details guys!
-Tony
Last edited by Tony Mamo @ AFR; 02-02-2011 at 01:40 PM.
02-02-2011, 03:08 PM
#40
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Thanks Tony. And what head gasket do u recommend with this just a cosmetics .040 gasket? And thanks again everyone for the help.
Btw Tony. What gains could I see going from out of the box 205s with a stock headgasket to a .040 and milling to 61cc?
Btw Tony. What gains could I see going from out of the box 205s with a stock headgasket to a .040 and milling to 61cc?