wot rpm’s??
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=1832
Printed Date: November-21-2024 at 6:50pm
Topic: wot rpm’s??
Posted By: Guests
Subject: wot rpm’s??
Date Posted: June-08-2005 at 12:59am
as many of you may know, I blew my exhaust hoses on my 1983 cc 2001 with a ford 351 engine, but today I fixed them; what a messy job. This is minor compared to the other problems I am having, but in order to fix my other problems, I was just wondering, what is everyone getting for rpm's at wide open throttle? Also, tell me what prop you are using and whether you are running any ballast.
With my boat, i am only getting 4,000 rpm's unweighted with an oj 4-blade prop. my timing is set at 22degrees btdc which is weird, but it is where it runs best. If I set it at the factory recommended 6 btdc, the boat doesn't run well...max of 3200rpm's wot and it is in and out. However, even with the timing advanced, the boat will only get 4,000 rpm's max, and after it runs at wot for a while, it doesn't want to idle. how can I fix this problem?? replaced the points, condenser, plugs, rebuilt the carb, cleaned the fuel filter. Cant do much else. Mechanical timing works....timing is 26degrees btdc at 4,000 rpm's. I guess the next steps are to check the compression and the coil. I think I am just gonna take it to the cc dealer and have them fix it b/c I am sick of putzing around and getting nowhere. Any advice is appreciated! Thanks.
Kyle
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Replies:
Posted By: JEFF KOSTIS
Date Posted: June-08-2005 at 2:08am
If your timing is set at 22 degrees btdc at idle, it should be a heck of alot more than 26 degrees btdc at 4000 rpm!! Set it at 10 degrees btdc at idle and then rev to 2500 rpm or so and should hit around 25-30 degrees btdc. This is hard to tell exactly cause the markings are not there.
Also check the dwell at different rpms. It should stay within spec.
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MUSTANG COUNTRY
http://www.correctcraftfan.com/diaries/details.asp?ID=1074 - 1974 Mustang 17
http://www.correctcraftfan.com/diaries/details.asp?ID=1093 - 1976 Mustang 17
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Posted By: 64 Skier
Date Posted: June-08-2005 at 5:48am
The mechanical advance is not working properly. The timing at 2500 RPM should be more in the 35 deg range. Your distributor advancing only 4 Degrees from idle to 4000 RPM is the problem.
Sounds like something is wrong with your distributor. If you get a new distributor, HEI or similar, remember to buy the matching coil.
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64 Skier
66" HO VTX and 67" HO Triumph
http://www.correctcraftfan.com/diaries/details.asp?ID=1071&sort=&pagenum=3&yrstart=1971&yrend=1975 - 71CC
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Posted By: Guests
Date Posted: June-11-2005 at 1:46am
Hey, thanks you guys for your inputs. You are correct. I took the boat in to the mechanic for them to take a look at and my mech. advance spring was laying in the bottom of the distributor. Along with that the techs found that the rebuilt carb may have been done with some automotive gasket in the float bowl allowing too much fuel into the carbureator at a given time, and they found that the impeller I replaced last year is broken again, so they are going to do a new distributor cap, rotor, plug wires, and a tune up kit, along with new h20 hose and I should be set. They are also gonna fix the carb if that gasket is in-fact the problem. Thank goodness my motor is ok tho...compression is from 125-135 with most at 125 so the motor didn't get burned up in the overheat.
Kyle
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Posted By: Jim_In_Houston
Date Posted: June-11-2005 at 2:21am
Hey Kyle, I just gotta chime in man. Based on what you said the carb ain't the problem - it's that spring laying in the bottom of the dist - not to say your carb doesn't need some work. Anyway, it's good to be headed back to the water right?
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Happy owner of a '66 and a '68 Mustang
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