Can I pay someone to run the rack?

Scott & Heather · March 18, 2014, 06:51:57 PM

I know I can take her to wwilliams in Grand Rapids, but I'm bringing the coach down to Indiana at some point. Is there a kind soul down there that would take something less than $1000 to run the rack and adjust my governor on our turbo 6v92? I've had offers from a great friend in Western Wisconsin to do it but that's the opposite direction from where we are headed. Just though I would poke club and see what I woke up.

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Seangie · March 18, 2014, 08:48:33 PM

Scott - the other Scott (Crosby I think?) Lives near Indianapolis and might be able help you out. He has Benny the Bus. I think he posts on Bus Nuts more than here.

-Sean

Fulltiming somewhere in the USA
1984 Eagle 10S
www.herdofturtles.org

Scott & Heather · March 19, 2014, 03:26:29 AM

Thanks Sean! Someone sent me a PM about him too. I'll see if I can connect

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Scott & Heather · March 19, 2014, 01:19:28 PM

Scott Crosby reached out to me. Thanks SO much Sean and RJ! This is going to make our year!

I'm gonna finally learn to run the rack!

luvrbus · March 19, 2014, 01:43:44 PM

Treat the rack like 6 carburetors on a motorcycle and you will be fine ? what makes you think the rack and the governor is off the previous problem you posted about was no smoke or power right

bevans6 · March 19, 2014, 02:02:46 PM

I was going to say that as well - running the rack is about the same as adjusting the valves on a regular old tractor engine, setting the injector height about the same, and adjusting the operating rack is about exactly like synchronizing 6 carbs. You do one side, transfer the adjustment over and do the other side. It can cost a lot because it's physically a pain (in the head, hands, back, knees, if not the arse) and so I literally wear a little helmet to protect my head when I'm doing mine. Getting into the governor is another story, but you shouldn't really have to be adjusting gap, buffer screws etc if the idle and high idle speeds are OK. There is also no reason for the adjustments to go out, except over a 100K miles. It's not like the cam wears out. The adjustments also have a lot more impact at idle than at full power. At idle, the injectors are "opened" about 2% - 3% to get the engine to run, so 1% difference is a 50% difference between 2 and 3, if you see, and you can feel it in the smoothness of the idle. At full power the injectors are opened 100%, so if one is at 99% you won't be able to tell. You set the racks to be identical at full power. So don't necessarily be running the rack to chase a power issue, except to make sure it's OK and can be eliminated.

On race engines, it's really hard to get a good idle for the same reason, sometimes you just can't get the carbs to synchronize. I had one guy who just wanted me to make sure the butterflies were both full open at full throttle and ignore the rest, he wanted it to stall at idle. He said if he wanted it to idle, he had a foot and a throttle pedal, and it only ran at full throttle on the track so nothing else mattered.

Brian

5B Steve · March 19, 2014, 02:24:20 PM

Scott,

I sent you PM.

Steve 5B......

Scott & Heather · April 01, 2014, 02:24:28 AM

Quote from: luvrbus on March 19, 2014, 01:43:44 PM
Treat the rack like 6 carburetors on a motorcycle and you will be fine ? what makes you think the rack and the governor is off the previous problem you posted about was no smoke or power right

Right Cliff. Low power, no smoke. The weather and my time have finally coincided to allow me to check fuel pressure today. I have the fuel pressure test kit rented and I'm performing the check today. How am I supposed to check it though? Full throttle? Idle?

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Scott & Heather · April 01, 2014, 05:05:03 AM

Ok. To cover all bases I checked the fuel pressure at idle, fast idle, and full throttle. Full throttle was accomplished using a weight on the fuel pedal so it may not actually be 100% full throttle but it was close. Here are the readings in that order:

Idle:

Fast idle:

Full throttle:

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Scott & Heather · April 01, 2014, 05:05:09 AM

sorry, double post.

lostagain · April 01, 2014, 05:50:38 AM

Those readings look normal

luvrbus · April 01, 2014, 05:58:05 AM

Scott,will the engine rev up fast and come back to idle in the same about of time also when the engine stop is engaged does it stop instantly or take a while ? fuel pressure is good

Scott & Heather · April 01, 2014, 06:15:46 AM

Quote from: luvrbus on April 01, 2014, 05:58:05 AM
Scott,will the engine rev up fast and come back to idle in the same about of time also when the engine stop is engaged does it stop instantly or take a while ? fuel pressure is good

Thanks LostAgain...and thanks Cliff. Engine stops quickly when stop lever is engaged. Engine idles back down after full throttle quickly. But I can take some video so you can tell me what your thoughts are.

Scott & Heather · April 01, 2014, 06:19:26 AM

This YouTube I took last summer shows a full throttle push and release:

https://www.youtube.com/watch?v=1dWMNFo5Z34

bevans6 · April 01, 2014, 07:40:04 AM

There was a recent thread by someone with low power (not revving up) that turned out to be a blocked up muffler... Just a thought, since I am planning on changing my muffler and have been looking in catalogs and such.

Brian