| www.iFourWinns.com https://www.smwebhead.com/phpBB3/ |
|
| Low WOT 4.3GL (AQ) https://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=15317 |
Page 1 of 1 |
| Author: | MikeD [ Sun Feb 19, 2017 10:34 am ] |
| Post subject: | Low WOT 4.3GL (AQ) |
After overheating my engine trying to get off a sandbar (stupid) my maximum WOT dropped to 4000 RPM's. Immediately afterwards I changed out my exhaust manifolds and risers only because of their age. Other than the loss of RPM's at WOT the engine does start and run good/smooth. Prior to writing this message I did check the butterfly's in the carburetor to insure that they are fully opened at max throttle. They were. I then attached a vacuum gauge to the carb to check the vacuum at various RPM's. 800-900rpm - 16in HG, 2000rpm - 20in HG and 3000rpm - 14in HG. At all rpm's gauge fluctuation was + or - 1/2in HG. Short of checking the engine timing I have run out of troubleshooting options and could sure use a little help. Any ideas? |
|
| Author: | 230 Mike [ Mon Feb 20, 2017 12:55 am ] |
| Post subject: | Re: Low WOT 4.3GL (AQ) |
Any prop damage? |
|
| Author: | MikeD [ Mon Feb 20, 2017 10:02 am ] |
| Post subject: | Re: Low WOT 4.3GL (AQ) |
No prop damage. As a matter of fact after my accident a friend gave me a SS 14 1/4 X 23 prop that I had re-hubed and re-pitched to 21. Only Lost about one or 200 rpm's compared to the Aluminum prop. When replacing both manifolds I performed a compression check and if I recall, only #1 cylinder was a tad low at about 125lbs. I'm beginning to wonder if it's something in the ignition system that just happened to go bad at the wrong time? I'm lost for answers. |
|
| Author: | jmb23802 [ Mon Feb 20, 2017 6:33 pm ] |
| Post subject: | Re: Low WOT 4.3GL (AQ) |
Something stuck to the hull? Hull damage? |
|
| Author: | MikeD [ Mon Feb 20, 2017 8:39 pm ] |
| Post subject: | Re: Low WOT 4.3GL (AQ) |
I wish it was that easy. No damage to the hull as far as I can see. |
|
| Page 1 of 1 | All times are UTC - 6 hours [ DST ] |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|