Very Dissapointed with dyno results today...
05-09-2006, 04:35 PM
#101
yeah if you have too much preload the cyls will lose compression so that will be a good way to check. I always thought that the lifter preload was based on plunger depth. Just keep us updated. Did you use a dial caliper to meause the exact length?
05-09-2006, 05:12 PM
#102
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Do you think the .050" preload is hurting anything?
I used the comp cams length checker and read the length that it said. I then ordered Comp pushrods so there would be no problems with length....plus i didnt have a 6+" caliper.
I used the comp cams length checker and read the length that it said. I then ordered Comp pushrods so there would be no problems with length....plus i didnt have a 6+" caliper.
05-09-2006, 05:50 PM
#103
use a tape measure, and read how many cm it is. I did this on mine and then checked it with a caliper and it was close enough. Those marks are accurate but I lost count a few times lol. This way you can be SURE what you have. I wouldnt think that preload would hurt anything but if it does it will show up in the compression check.
05-09-2006, 11:28 PM
#104
Originally Posted by joshp14
Do you think the .050" preload is hurting anything?
I used the comp cams length checker and read the length that it said. I then ordered Comp pushrods so there would be no problems with length....plus i didnt have a 6+" caliper.
I used the comp cams length checker and read the length that it said. I then ordered Comp pushrods so there would be no problems with length....plus i didnt have a 6+" caliper.
how about if you get back to stock lifters and 7.400" PR's, just to make sure that the 7.325" PR's and Morel lifters are not the problem.
05-10-2006, 12:11 AM
#105
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If he was actually that meticulous when measuring preload I doubt that is the problem. As long as he has SOME preload it shouldnt effect power. He should find out alot from a compression and leakdown. If the leakdown is fine, but the compression sucks it could easily be a valvetrain issue of some sort. At that point I would bet on cam timing.
05-10-2006, 03:20 AM
#106
Originally Posted by cantdrv65
If he was actually that meticulous when measuring preload I doubt that is the problem. As long as he has SOME preload it shouldnt effect power. He should find out alot from a compression and leakdown. If the leakdown is fine, but the compression sucks it could easily be a valvetrain issue of some sort. At that point I would bet on cam timing.
if it is a cam timing problem i would say the cam is not installed correctly, i mean the cam is off too much either advanced or retarded. i.e. the cam is not installed dot to dot.
05-10-2006, 07:58 AM
#107
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Well for one, my stock lifters were destroyed and I highly doubt its the lifters...plus the idea of pulling the heads back off isnt that attractive.
Cantdrv65 is correct, I will find out a lot this weekend when I do the tests.
Also, i'm 200% sure I installed dot to dot...I triple checked and also had another set of eyes check while also rotating the crank back and forth to make absolute sure they were dot to dot. If it is a timing issue, it is the camshaft. Keep in mind I was one of the first people to get this new F13 grind so ho knows....
Cantdrv65 is correct, I will find out a lot this weekend when I do the tests.
Also, i'm 200% sure I installed dot to dot...I triple checked and also had another set of eyes check while also rotating the crank back and forth to make absolute sure they were dot to dot. If it is a timing issue, it is the camshaft. Keep in mind I was one of the first people to get this new F13 grind so ho knows....
05-10-2006, 08:14 AM
#108
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Josh,
Looking at your results I think you need a proper tune on the dyno.
When you factor in the swap to 4.10s (~10RWHP loss) plus the fact you aren't tuned your gains aren't too bad.
If you are running cats you are down 10-15RWHP versus an ORY. (My car was consistently down that much with the 360 and 385ci combos) I was using dual 500 plus cfm carsound/magnaflow cats on the car)
Looking at your results I think you need a proper tune on the dyno.
When you factor in the swap to 4.10s (~10RWHP loss) plus the fact you aren't tuned your gains aren't too bad.
If you are running cats you are down 10-15RWHP versus an ORY. (My car was consistently down that much with the 360 and 385ci combos) I was using dual 500 plus cfm carsound/magnaflow cats on the car)
05-10-2006, 09:30 AM
#109
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Well I really hate to pay to get a dyno tune only for them to say "sorry you have something else mechanically wrong" and I'm out $400-500 in tuning for nothing. I will get these checks done to try to get it narrowed down.
I also spoke with Tony Mamo from AFR 2 days ago and received some advice from him as well so we'll see how these tests turn out.
I also spoke with Tony Mamo from AFR 2 days ago and received some advice from him as well so we'll see how these tests turn out.
05-10-2006, 03:28 PM
#110
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Originally Posted by joshp14
Well I really hate to pay to get a dyno tune only for them to say "sorry you have something else mechanically wrong" and I'm out $400-500 in tuning for nothing. I will get these checks done to try to get it narrowed down.
I also spoke with Tony Mamo from AFR 2 days ago and received some advice from him as well so we'll see how these tests turn out.
I also spoke with Tony Mamo from AFR 2 days ago and received some advice from him as well so we'll see how these tests turn out.
05-10-2006, 05:15 PM
#112
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OK fellas...had some down time at work today so I pulled the TA in and did the cranking compression test and leakdown test. Here are the results...first number is the cylinder, 2nd number is the cranking compression (4 cranks), and 3rd number is the leakdown percentage.
1-205-7%
2-215-19%
3-210-10%
4-215-9%
5-205-5%
6-210-16%
7-215-19%
8-215-19%
I didnt even think to tap the valve on the higher perecentage cylinders to see if it changed. According to the leakdown gauge, these were all low readings. Keep in mind the car has 99k on the shortblock so it may be a little worn out and skew the HP readings by some. I also gapped down the TR55's to .045"...I didnt have the TR6's to put it with me so I'll do it another time.
1-205-7%
2-215-19%
3-210-10%
4-215-9%
5-205-5%
6-210-16%
7-215-19%
8-215-19%
I didnt even think to tap the valve on the higher perecentage cylinders to see if it changed. According to the leakdown gauge, these were all low readings. Keep in mind the car has 99k on the shortblock so it may be a little worn out and skew the HP readings by some. I also gapped down the TR55's to .045"...I didnt have the TR6's to put it with me so I'll do it another time.
05-10-2006, 06:50 PM
#113
The compression doesnt look too bad. Out of curiousity I would wondder if it changed the leak down pulling the PR's out. Not trying to keep pushing the PR deal but my compression tests showed higher than that with a lower CR than you, so it just makes me curious.
When it comes time to tuning dont waste any more money though, thats for sure. You have my email and I have your tune, I know we wont have a problem getting the tune right.
When it comes time to tuning dont waste any more money though, thats for sure. You have my email and I have your tune, I know we wont have a problem getting the tune right.
05-10-2006, 07:08 PM
#114
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Originally Posted by WS6FirebirdTA00
The compression doesnt look too bad. Out of curiousity I would wondder if it changed the leak down pulling the PR's out. Not trying to keep pushing the PR deal but my compression tests showed higher than that with a lower CR than you, so it just makes me curious.
When it comes time to tuning dont waste any more money though, thats for sure. You have my email and I have your tune, I know we wont have a problem getting the tune right.
When it comes time to tuning dont waste any more money though, thats for sure. You have my email and I have your tune, I know we wont have a problem getting the tune right.
05-10-2006, 08:42 PM
#116
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Originally Posted by WS6FirebirdTA00
ok, then I wonder how it would have been with them on there with that cyl on the compression stroke lol 
05-11-2006, 05:13 AM
#118
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Hmmm both the leakdown and compression tests seem right in line. Plugged cats? Either those cats have broken up inside and are really restricting flow or you've just got a pig. 
05-11-2006, 08:33 AM
#120
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Originally Posted by Abdullah
may be you have the bad camshaft F13? ( from the bad batch).
https://ls1tech.com/forums/showpost....8&postcount=63