|
Re: car won't 60 foot video
[Re: FastmOp]
#2122981
08/01/16 10:41 PM
08/01/16 10:41 PM
|
Joined: Jun 2004
Posts: 928
birdtracker
OP
super stock
|
OP
super stock
Joined: Jun 2004
Posts: 928
|
|
|
|
Re: car won't 60 foot video
[Re: FastmOp]
#2122992
08/01/16 10:55 PM
08/01/16 10:55 PM
|
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
WHITEDART
master
|
master
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
|
I'm going to have to say the converter is too tight or broken... you are over 2 tenths off in the 60-foot.. your mph is on par with my old smb it would run 10 flat. With a 1.33 60ft. .it would stall to 6700.and I would shift at about 7700 rpm
In the 8s N/A.with Brett miller W8's
5.07 at 133 at 2700lb
|
|
|
Re: car won't 60 foot video
[Re: WHITEDART]
#2123039
08/01/16 11:35 PM
08/01/16 11:35 PM
|
Joined: Jun 2004
Posts: 928
birdtracker
OP
super stock
|
OP
super stock
Joined: Jun 2004
Posts: 928
|
since I have had this issue I have 2nd guessed everything and double and even triple check stuff. Then recheck what I checked. I pitted at the end of the track and after slowing would shut the car off and coast to my pit. I took all the plugs out and looked at the color to make sure it wasn't lean which it is not. I put a compression gauge in 5 different cylinders there. 3 on one side and 2 on the other.70 psi was the highest. So I just went out tonight and did a compression test with the carb wide open using 3 different gauges that I checked to my air compressor which shuts off at 120.
#1-50 #2-40
#3-70 #4-70
#5-65 #6-50
#7-40 #8-70
I am depressed. Birdtracker
Last edited by birdtracker; 08/01/16 11:36 PM.
|
|
|
Re: car won't 60 foot video
[Re: birdtracker]
#2123046
08/01/16 11:39 PM
08/01/16 11:39 PM
|
Joined: Jun 2004
Posts: 928
birdtracker
OP
super stock
|
OP
super stock
Joined: Jun 2004
Posts: 928
|
Motor is 14.8-1 and I run it on C-16. It had 235 passes on it when it was torn down and new aluminum rods installed. So tomorrow night its either leakdown test or cam timing. I am now suprised it ran with that low of compression Birdtracker
Last edited by birdtracker; 08/01/16 11:42 PM.
|
|
|
Re: car won't 60 foot video
[Re: birdtracker]
#2123054
08/01/16 11:54 PM
08/01/16 11:54 PM
|
Joined: Jan 2004
Posts: 8,391
fredericksburg,va
cudaman1969
master
|
master
Joined: Jan 2004
Posts: 8,391
fredericksburg,va
|
since I have had this issue I have 2nd guessed everything and double and even triple check stuff. Then recheck what I checked. I pitted at the end of the track and after slowing would shut the car off and coast to my pit. I took all the plugs out and looked at the color to make sure it wasn't lean which it is not. I put a compression gauge in 5 different cylinders there. 3 on one side and 2 on the other.70 psi was the highest. So I just went out tonight and did a compression test with the carb wide open using 3 different gauges that I checked to my air compressor which shuts off at 120.
#1-50 #2-40
#3-70 #4-70
#5-65 #6-50
#7-40 #8-70
I am depressed. Birdtracker Wow, are there rings on those Pistons? Seriously, check the cam again, I was 2 1/2 times that with a 7.90 lift cam and 15.19 cp. Do the leak down first. What type rings.
|
|
|
Re: car won't 60 foot video
[Re: birdtracker]
#2123087
08/02/16 12:41 AM
08/02/16 12:41 AM
|
Joined: Jan 2004
Posts: 8,391
fredericksburg,va
cudaman1969
master
|
master
Joined: Jan 2004
Posts: 8,391
fredericksburg,va
|
I thought it should be around 180. The rings are Childs and Albert Moly file fit. I did them. I did look around my garage to see if I forgot!!! So on leakdowns that I have done it takes the piston to be at the top to have both valves closed. I may have to ensure valves are closed and piston maybe not all the way up? Birdtracker Piston all the way up and locked so it won't move with the air pressure, on the firing stroke, no valve should be open at that point. Listen to where the air goes, intake, exhaust or crankcase. You don't want to hear it come out the in-ex, bad, bad.
|
|
|
Re: car won't 60 foot video
[Re: birdtracker]
#2123208
08/02/16 08:56 AM
08/02/16 08:56 AM
|
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
sgcuda
master
|
master
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
|
Is there a lot of blowby? If not I don't think a leak down test will tell you anything. Those compression readings can't be right. I don't know of any engines that will even fire at 40-70 psi. It would have to sound like its just spinning with the plugs out. Too consistent for there to be any single cylinder issue, which means there has to be something common among all cylinders. Camshaft installed wrong is most likely suspect. Or all of the pistons are way below deck.
[image][/image]
|
|
|
Re: car won't 60 foot video
[Re: sgcuda]
#2123262
08/02/16 10:41 AM
08/02/16 10:41 AM
|
Joined: May 2005
Posts: 1,030
ohio
67mprfan
super stock
|
super stock
Joined: May 2005
Posts: 1,030
ohio
|
X2
Double check CP test again I don't see how it could have ran that MPH with no compression
71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it.
67 Belvedere that worked it's way in the 10's
|
|
|
Re: car won't 60 foot video
[Re: birdtracker]
#2123334
08/02/16 12:15 PM
08/02/16 12:15 PM
|
Joined: Jan 2003
Posts: 14,515
So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,515
So. Burlington, Vt.
|
I'm gonna say if the compression tester gauge has been confirmed to be (at least reasonably) accurate, it's likely got bent valves.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
|
|
|
Re: car won't 60 foot video
[Re: birdtracker]
#2123335
08/02/16 12:16 PM
08/02/16 12:16 PM
|
Joined: Jan 2004
Posts: 8,391
fredericksburg,va
cudaman1969
master
|
master
Joined: Jan 2004
Posts: 8,391
fredericksburg,va
|
Motor is 14.8-1 and I run it on C-16. It had 235 passes on it when it was torn down and new aluminum rods installed. So tomorrow night its either leakdown test or cam timing. I am now suprised it ran with that low of compression Birdtracker Just remembered reading this...235 runs then new rods. Where they the same size? Anything else changed? What where the times before these changes? Did you run this engine before the changes? Did you just buy it ?
|
|
|
Re: car won't 60 foot video
[Re: sgcuda]
#2123434
08/02/16 02:52 PM
08/02/16 02:52 PM
|
Joined: Jan 2003
Posts: 8,192
Plymouth, MI
Blusmbl
master
|
master
Joined: Jan 2003
Posts: 8,192
Plymouth, MI
|
Those compression readings can't be right. I don't know of any engines that will even fire at 40-70 psi. One of my lawn tractors has about 60psi of cranking compression. It starts just fine. You need a surprisingly little amount of compression to get an engine to run. As others have mentioned, check valve timing, that the valves themselves aren't slightly bent, etc.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
|
|
|
Re: car won't 60 foot video
[Re: birdtracker]
#2123772
08/03/16 12:25 AM
08/03/16 12:25 AM
|
Joined: Jan 2004
Posts: 8,391
fredericksburg,va
cudaman1969
master
|
master
Joined: Jan 2004
Posts: 8,391
fredericksburg,va
|
so I just came in from the garage. I went ahead and pulled the radiator, fan, alternator and lower crank pulley. I installed the degree wheel so 0 lined up with the TDC pointer. I pulled the drivers side valve cover off and went to put my dial indicator on and the clamp that adjusts broken in 5 pieces. So I will need to pick up new dial indicator base and need to put my hands on a leakdown tester. Thanks for getting me headed in the right direction. Birdtracker One more thing, make sure the tdc pointer is on true top center first. I made a stop to go in the spark plug hole and touch the piston, rotate both ways and mark, split the difference and bingo, right on.
|
|
|
Re: car won't 60 foot video
[Re: birdtracker]
#2123783
08/03/16 12:38 AM
08/03/16 12:38 AM
|
Joined: Sep 2015
Posts: 1,096
Australia
ozymaxwedge
super stock
|
super stock
Joined: Sep 2015
Posts: 1,096
Australia
|
Birdtrack, could you answer a few of the questions put to you ? See DVW's last post.
1963 Plymouth Max Wedge
1971 Barracuda
|
|
|
Re: car won't 60 foot video
[Re: cudaman1969]
#2123913
08/03/16 10:48 AM
08/03/16 10:48 AM
|
Joined: May 2005
Posts: 2,015
Apollo, PA.
B1MAXX
top fuel
|
top fuel
Joined: May 2005
Posts: 2,015
Apollo, PA.
|
so I just came in from the garage. I went ahead and pulled the radiator, fan, alternator and lower crank pulley. I installed the degree wheel so 0 lined up with the TDC pointer. I pulled the drivers side valve cover off and went to put my dial indicator on and the clamp that adjusts broken in 5 pieces. So I will need to pick up new dial indicator base and need to put my hands on a leakdown tester. Thanks for getting me headed in the right direction. Birdtracker One more thing, make sure the tdc pointer is on true top center first. I made a stop to go in the spark plug hole and touch the piston, rotate both ways and mark, split the difference and bingo, right on. x2, too much dwell at tdc, and not enough known accuracy in pointer to be trusted.
|
|
|
Re: car won't 60 foot video
[Re: birdtracker]
#2123992
08/03/16 01:05 PM
08/03/16 01:05 PM
|
Joined: Jan 2003
Posts: 14,515
So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,515
So. Burlington, Vt.
|
The cam would have to be a few teeth off for the comp test to go from what it should be, down to 70-80psi. It's down 100psi for what it should be.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
|
|
|
|
|
Let us know what you find 
If you never make a mistake racing you ain't doing enough 
What cylinder head cc are we looking at here? If its in the 70's you need some thing with 258-264 @ .050 intake to get going...especially with a 4.10 gear and big tires.
