| MudmotorTalk.com http://mudmotortalk.com/mmt_v2/ |
|
| Engine life of Modded Motors http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=7184 |
Page 1 of 1 |
| Author: | mharms909 [ Sun Jan 17, 2010 4:02 pm ] |
| Post subject: | Engine life of Modded Motors |
What is the engine life of modded motors and what parts are usually the first to detonate(fail)? was thinking of possibly working the heads on my 27hp kohler. |
|
| Author: | duckhunter888 [ Sun Jan 17, 2010 5:16 pm ] |
| Post subject: | Re: Engine life of Modded Motors |
Shorter than stock |
|
| Author: | JpEater [ Sun Jan 17, 2010 6:51 pm ] |
| Post subject: | Re: Engine life of Modded Motors |
My recent research for my 27 Kohler has revealed that will head work, carb swap, exhaust and an UN-TOUCHED governor that the Kohler would be a very reliable motor. Internal mods and an increase in compresson will equal a shorter life span. |
|
| Author: | deadbird8 [ Sun Jan 17, 2010 7:44 pm ] |
| Post subject: | Re: Engine life of Modded Motors |
| Author: | SP [ Tue Jan 19, 2010 7:09 pm ] |
| Post subject: | Re: Engine life of Modded Motors |
Question- What mods (or combination of) typically cause the compression to increase to a point that you are sacrificing the longevity of your motor? Just curious what some of the guys would say that have pushed these motors to their limits and beyond. |
|
| Author: | JD [ Wed Jan 20, 2010 8:04 am ] |
| Post subject: | Re: Engine life of Modded Motors |
my stage 3 is on it's 3rd rebuild in under 100 hours. decking the heads and cam work with flat top pistons all increase compression. I was running 225 psi . While it ran it ran great. Firsts rebuild a evt cam failed with in 2 hours, second rebuild due to fact the "boat Dr" did not want to do a complete tear down when replacing the first cam, third rebuild the fuel mixture leaned out due to a leak in the fuel primer bulb (my best guess). I bought a spare stock 35 twin to run while the bomb is waiting to be rebuilt. I am going back stock pistons 9 if possible), and having a thicker head gasket made to bring compression under 190. JD |
|
| Author: | craig [ Tue Feb 09, 2010 10:11 pm ] |
| Post subject: | Re: Engine life of Modded Motors |
| Author: | Brinkleydog [ Wed Feb 10, 2010 3:30 pm ] |
| Post subject: | Re: Engine life of Modded Motors |
I had almost 80 hrs on stage 1 with no big problems only a leaking case gasket which alot of stock motors do. Stage 2 lasted UM 10 hrs......its fun while it last but mark my words a few years from now we will have reliable madded motors wunning 35+ that last 100's of hours. later |
|
| Author: | JD [ Thu Feb 11, 2010 6:02 pm ] |
| Post subject: | Re: Engine life of Modded Motors |
[quote="craig"][quote="JD"]my stage 3 is on it's 3rd rebuild in under 100 hours. decking the heads and cam work with flat top pistons all increase compression. I was running 225 psi . While it ran it ran great. Firsts rebuild a evt cam failed with in 2 hours, second rebuild due to fact the "boat Dr" did not want to do a complete tear down when replacing the first cam, third rebuild the fuel mixture leaned out due to a leak in the fuel primer bulb (my best guess). I bought a spare stock 35 twin to run while the bomb is waiting to be rebuilt. I don't know for sure. In outboards a leaking fuel line can cause a loss of top end. The jetting was set up with out a leak and a consistent fuel pressure and set barely rich, a intermittent leak could cause a low fuel level in the bowel and loss of a fuel to the main jets. It was running fine at wot them it would miss and stumble a few times then kill, it would restart with out problems . It was acting like a water or dirt in the fuel bowel. It did it even in my drive way. The miss and stumble was detention. JD I |
|
| Author: | craig [ Thu Feb 11, 2010 6:47 pm ] |
| Post subject: | Re: Engine life of Modded Motors |
If that was the case every engine that runs out of gas would burn up. If you was detonatin' you had other problems such as low octane level. |
|
| Author: | coondik [ Thu Feb 11, 2010 6:51 pm ] |
| Post subject: | Re: Engine life of Modded Motors |
| Author: | JD [ Thu Feb 11, 2010 8:29 pm ] |
| Post subject: | Re: Engine life of Modded Motors |
Stock timing, cam looks new, I had 10 gals of 91 octane in the tank and added 5 of regular. Compression was 225 on each side. I had just made a plate to mount the mikuni like they do on Harley's, It did not act like it had any vacuum leaks. The fuel line would only leak when it was moved . I don't think I ever know what happened. JD |
|
| Page 1 of 1 | All times are UTC - 6 hours |
| Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group http://www.phpbb.com/ |
|