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| Boothy |
 Apr 20 2025, 06:35 PM
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#1
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Member  Group: Members Posts: 108 Joined: 17-January 19 From: Abington, MA Member No.: 22,805 Region Association: North East States  |
Cheers all!
Sorry, but I again need to ask for help. New engine blowing smoke. 1.7 punched out to 2.0 with a big bore kit. Cam, Weber 40s. It started and ran pretty well late last fall. Used engine break-in oil as recommended. No smoke but sluggish acceleration -fine at high RPM. With the warm weather (finally) I swapped out the Weber jets to the recommended .50, 1.50, and 1.95. Ran it up to 3300 with a timing light. I remembered I did static timing but not dynamic. Now it sounds pretty good but I'm seeing light blue smoke and a really black exhaust. I don't think the jets were that different but no markings so not sure. My immediate horror was a broken ring -I really don't want to pull the engine again. It idles fine and sounds strong. I'll do a compression check. When it idles, there's no smoke. When I bring it up, it begins to smoke a little. Then it's consistent—no horrible but noticeable. It sounds strong. It idles nicely at a 1000 and revs up fine. I'm hesitant to push it until I figure out what's going on. Changed the oil to 20W-50. Could it be, with the soot on the tailpipe, my jets are wrong? Stretch I know but hopeful. Heads are new so the oil in the guides shouldn't be an issue. As always, thanks in advance! |
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| TheCabinetmaker |
Jun 9 2025, 04:56 PM
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#2
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I drive my car everyday Group: Members Posts: 8,365 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
What is 1.7 "punched out to 2L"?
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Posts in this topic
Boothy Smoke Apr 20 2025, 06:35 PM
bdstone914 Oil smoke? Black run rich smoke? I would start wit... Apr 21 2025, 02:11 AM VaccaRabite Possible issues:
Rings have not yet seated.
Overfi... Apr 21 2025, 06:00 AM Boothy Thank you for the detail! Will do all in order... Apr 21 2025, 07:17 AM Eric_Shea Compression test first. If everything is good the... Apr 21 2025, 08:17 AM Nogoodwithusernames My rebuild stock-ish 1.7 was breaking in and runni... Apr 21 2025, 09:15 AM Boothy An update...
Thank you all for the advice.
It... Jun 9 2025, 07:32 AM emerygt350 I found my driver's side is a pain too. I use... Jun 9 2025, 01:13 PM
Boothy Thank you! I'll try the gasket maker. I, t... Jun 9 2025, 02:12 PM Boothy
What is 1.7 "punched out to 2L"?
The ... Jun 9 2025, 06:12 PM emerygt350 I have the 96mm pistons/sleeves from AA. They hav... Jun 9 2025, 06:39 PM brant How many miles on the engine since the build? Jun 10 2025, 10:47 AM Boothy
How many miles on the engine since the build?
N... Jun 23 2025, 09:14 AM sixnotfour
you need to drive accell and let decel load ring... Jun 23 2025, 09:54 AM VaccaRabite Hey Boothy,
its is likely that your rings are not... Jun 23 2025, 12:21 PM 930cabman or overfilled Jun 23 2025, 12:44 PM |
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