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Old 10-16-2020, 06:01 PM   #151
wtarkington
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Low compression wouldn't cause a high idle, but as others have said: an air leak definitely will. Is the linkage returning fully, right away or is it a little sluggish ?
The linkage pulls back immediately as it should. Got new bushings on it, too.
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Old 10-16-2020, 06:05 PM   #152
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Do you have a timing light? Check the timing is set to 17-19 deg @1500 rpm?
I redid the timing and it’s perfectly set to 17 at 1500 rpm.

Last edited by wtarkington; 10-18-2020 at 10:08 PM..
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Old 10-20-2020, 02:42 PM   #153
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Glad to hear from you Dodson. My manifold is the one where the intake and exhaust are all connected. No extra flaps etc. I actually just changed the gasket recently and installed all new studs. The surface looked good to me.
Surfaces and finish generally arenít the problem. Sometimes you canít see it, but after machining, if someone dented the side it will raise a spot on the mating surface. Running an oil stone over it and youíll feel the hang up and rub it a bit more and it will polish the raised up bit.

All the things youíve looked at point me to an air leak. Do your throttle butterflyís have the poppet valves? Or are they a solid disc?
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Old 10-20-2020, 08:55 PM   #154
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Originally Posted by cwdodson88 View Post
Surfaces and finish generally arenít the problem. Sometimes you canít see it, but after machining, if someone dented the side it will raise a spot on the mating surface. Running an oil stone over it and youíll feel the hang up and rub it a bit more and it will polish the raised up bit.

All the things youíve looked at point me to an air leak. Do your throttle butterflyís have the poppet valves? Or are they a solid disc?
Theyíre a solid disc. No TOV valve or anything like that.

I did a compression check today just for giggles, and at first got almost exactly 125psi across al cylinders. Redid the valves and psi rose a bit on all, between 135-145.

I noticed the last cylinder spark plug was clean as a whistle. No burn, no black, just silver. All other spark plugs were a normal brownish.
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Old 10-22-2020, 01:19 PM   #155
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Theyíre a solid disc. No TOV valve or anything like that.

I did a compression check today just for giggles, and at first got almost exactly 125psi across al cylinders. Redid the valves and psi rose a bit on all, between 135-145.

I noticed the last cylinder spark plug was clean as a whistle. No burn, no black, just silver. All other spark plugs were a normal brownish.
That seems low
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Old 10-22-2020, 01:28 PM   #156
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That seems low

Thatís what I was thinking. Itís supposed to be at least 175-180, correct? I know burnt valves can cause you to lose up to 25% compression. 25% of 180 is 45. 180 - 45 = 135, just about where the compression of my cylinders are. I know thatís probably a far reach, but itís an idea. Could I have some valve issues?
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Old 10-22-2020, 02:00 PM   #157
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Thatís what I was thinking. Itís supposed to be at least 175-180, correct? I know burnt valves can cause you to lose up to 25% compression. 25% of 180 is 45. 180 - 45 = 135, just about where the compression of my cylinders are. I know thatís probably a far reach, but itís an idea. Could I have some valve issues?
Speaking of which....I just did the ďdollar billĒ test, where you hold a piece of paper at the exhaust. It would occasionally get sucked back into the exhaust really quickly. More indication of valve issues?
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Old 10-23-2020, 10:34 AM   #158
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One other thing would be a wet vs dry compression test, or a good leak down test.
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Old 10-23-2020, 11:34 AM   #159
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One other thing would be a wet vs dry compression test, or a good leak down test.
Yea thatís not a bad idea. Iíll look into that.
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Old 11-27-2020, 02:27 AM   #160
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Two bent valves!

I ended up just pulling the head and brought it over to the guy that rebuilt it the engine for me, at Engine Components & Machine (ECM) in Santa Ana. He knows these engines and did a good job with the rebuild. He took the head apart and told me I had one bent intake valve and one bent exhaust valve. Should be finished with it any day now.

I was so relieved when I heard this. Finally found something real, that can be fixed. No running around in circles trying to find something to fix or hunches.

I plan on completely cleaning the engine bay while the head is off. I’ll report back once the head is back on and everything is buttoned up and I run it.

The pistons looked good and move good in the block. I understand bent valves can be the result of them hitting the piston. Could this have happened due to maladjusted timing?
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Old 11-27-2020, 03:15 AM   #161
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FB0-CE210-8-ACA-4497-A0-CE-B83-E2-EBFD619

Waiting at the body shop

30015-AC7-E381-4-D30-ADF6-554657-CE61-B3

A0-EC7104-4234-4-DEE-A13-B-AE380-BF66-E70

Last edited by wtarkington; 11-28-2020 at 06:25 PM..
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Old 11-27-2020, 03:25 AM   #162
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I donít remember how to post pics on this forum anymore lol

Last edited by wtarkington; 11-27-2020 at 03:41 AM..
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Old 11-28-2020, 06:26 PM   #163
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Came out good!

DAADAC2-E-37-AA-4177-9-CA5-F8-CE585-AAEA4
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Old 11-28-2020, 06:31 PM   #164
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The kids car fits inside my car. Been enjoying this car all summer, all while not realizing I had valve damage.

63-E7-F240-9-FD6-49-F6-9285-F4-B8-B7-FF5-D1-B

9-D2-A6-E69-0935-4-AE1-982-A-A2386907-D5-C6

544-B61-B5-93-B1-4-F36-A9-A6-A014-FA2-EF4-D4
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Old 11-28-2020, 06:46 PM   #165
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Sorry for the large pics. Still figuring this out.

1227-DF24-C0-A4-4-EE0-A7-E1-C9458-C8-D24-FA

My copilot

943483-BF-0-F21-4522-9196-286-EC5392-F41

Steering coupler old vs new

C77-BC3-AB-75-ED-4-CBC-B38-C-D4-AA1-E632-CE6

Her first show

D850-D612-823-B-4-B10-B01-B-DC1-D7-BFE8827


75058-A1-E-5-D10-4-FDF-829-A-10730-E47051-A


F11-D9641-D633-4-FD2-8-F7-D-3-D398563-D9-E6

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Old 11-28-2020, 06:59 PM   #166
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I’m a tattoo artist by day, so every once in awhile I have time to screw around and draw some stuff. I decided to see what an Amazon might look like with big 50’s style fins

087-FFABD-98-B1-4-A55-BADF-11-FFA9-C15700

Another sketch from a few years back

957-ACC38-2701-4-D48-AA74-D59705-A5414-C


Finished this one at a tattoo convention a few years back

F84-E7-DFB-850-F-4-B2-B-B9-C1-AE6781-FA53-B0
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Old 12-15-2020, 08:20 PM   #167
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Got the head back and back into the car. No more high idle, and I was able to tune the car nicely, all at the correct timing. She purrs with a nice low idle, and feels stronger than ever. It was indeed the 2 bent valves. I guess they can “stretch” do to overheating. That could have been the culprit, but I wouldn’t know. With the timing right, valves adjusted, carbs tuned, all I need to do is connect the choke according to the green book. I’ve been enjoying driving it every this past week, and I’m looking forward to digging into cosmetic stuff now. Thanks to anyone who helped me out!

4-B9-D8827-2320-47-D6-9111-1-CDEE5-CFA14-F

02-C8-F4-A1-A648-4-A68-A6-F1-069-CCE576-DBE

45-A0-D293-FD19-4340-976-F-B9-CBCFAD12-F9

671-B3-E42-BC9-C-450-C-BE91-116-C8555-A87-C
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Old 12-15-2020, 10:00 PM   #168
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Love the Up tattoo. Car is coming along nice!
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Old 12-15-2020, 10:01 PM   #169
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Double
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Old 12-16-2020, 03:50 AM   #170
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Love the Up tattoo. Car is coming along nice!
Thank you! The work has been rewarding!
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Old 12-17-2020, 10:08 AM   #171
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Very cool. Are you leaving the roof as-is and just painting the body ? Are you going to match the existing paint or just start from scratch ? Nice work on the engine, these are great engines when they're working well. Easy to maintain.
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Old 12-20-2020, 12:28 AM   #172
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Really cool car.

Why no valve stem seals? Granted, they don't do a whole lot...
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Old 12-21-2020, 05:19 PM   #173
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Really cool car.

Why no valve stem seals? Granted, they don't do a whole lot...
I don't think the B18 had valve stem seals. Although I may be mistaken. The B20 heads should have them.
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Old 12-21-2020, 06:06 PM   #174
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B18's use an umbrella style seal. It's held to the stem by the groove just above the retainer.



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Old 12-21-2020, 06:27 PM   #175
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B18's use an umbrella style seal. It's held to the stem by the groove just above the retainer.



Ah, I see them now. It almost looked like there wasn't anything there. I think my car might be missing those.
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