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 Post subject: Sillysand clevland(MUD)
PostPosted: Fri May 12, 2017 12:53 pm 
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Joined: Tue Jun 02, 2015 2:28 pm
Posts: 81
People worry about losing a cam lobe and what it can do to a motor..
Now think never ending sand and water...
Now before I say any more a simple presser test would have found this......That was not done..
I help out on a mod mud truck when I have time...It is a top runner.408C motor.
Lost at least two motors last year from dirt....Spent many hours trying to seal up the motor from a visual aspect but it keep coming..
Cleaning up the heads this week while whating for the new pistons+crank turn+cam+bearings and the normal parts.
What do I find? .........Missing dowel pin in the head that is not a blind hole!! Turkey pan holder at its finest...
Can you say sucking sand and water...Yes you can!!!!
Unknown dollars and time later..........
Photos to big to post..


Blykins I will be calling you on a new mech. roller cam


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PostPosted: Fri May 12, 2017 3:22 pm 
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Just sent in the purchase order for it......will PM you the specs so that you'll know what to expect.

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www.lykinsmotorsports.com
brent@lykinsmotorsports.com


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PostPosted: Fri May 12, 2017 7:02 pm 
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Truck is 3400lb...without mud..if that makes any difference


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PostPosted: Sat May 13, 2017 8:12 am 
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Joined: Mon Oct 29, 2012 1:52 pm
Posts: 337
I saw one of those dowels get left out on a circle track car one time. It never leaked a drop running in the shop but it covered about 1/2 the car with oil in one lap of the track.


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PostPosted: Sat May 13, 2017 8:42 pm 
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Joined: Tue Jun 02, 2015 2:28 pm
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Pistons showed up. Old 4.018 New 4.037 and a bit longer.... find out how it fits tomorrow


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PostPosted: Sun May 14, 2017 6:01 am 
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Ray, I think you'd be better served with a different piston.

If you're looking for as much horsepower as you can get, I would opt for a piston with a smaller ring pack (a 1.5/1.5/4mm is pretty close to a 1/16, 1/16, 3/16) that will seal better with less friction. I'd go with a .043/.043/3mm or even a 1mm/1mm/2mm. You'd also benefit with some vertical gas ports and hook the whole deal up to a header-vac system.

I think there's horsepower left on the table there.

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Brent Lykins, Lykins Motorsports
www.lykinsmotorsports.com
brent@lykinsmotorsports.com


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PostPosted: Sun May 14, 2017 8:38 am 
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Joined: Mon Oct 29, 2012 1:52 pm
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Another BIG area where dirt can get into the engine and that tends to be a moving target is the air filtration. About 20 years ago I built an engine for a circle track(dirt) racer who was a beginner and who spent a lot of time running behind about 10-15 other cars on a very dusty 1/2 mile track. He worked really hard to make the car reliable and to finish every race and by doing so he ended up 8th in points at the end of the season. He used a large well sealed filter with a K and N element which he cleaned and re oiled using their cleaner and oil every other week. After the season when I took the engine apart I was amazed to see how little "dirt damage" there was when carefully examining the carburetor, piston rings, ring lands etc. The filter worked.

Fast forward to a few years ago with another dirt circle track racer this one who's a hard runner but who was also using a K and N. When servicing the carburetor I could ALWAYS see small traces of very fine dust at the bottoms of the emulsion wells in the metering block(a good place to look). Something changed with K and N's stuff and they do NOT work as well as they used to by a long shot. That customer switched to using an R2C cleanable racing air filter setup and the dusting evidence all disappeared.


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PostPosted: Sun May 14, 2017 7:14 pm 
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Joined: Tue Jun 02, 2015 2:28 pm
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This started out as a Racer Rush!!!!!..In on Monday out on Thursday after sitting on a garage floor 10 miles away for 7 months.
I had no hand in ordering the pistons and if i did i dont think i would have ordered them with gas ports or a different ring set up..
The gas porting can be delt with.....
The ring change not so much..

It has a header vac system ... Thats why i think it sucked dirt in and did not blow oil out .
The air filter is now cleaned daily and sealed with grease as you would a moto cross bike..it was not allways so.


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PostPosted: Wed May 17, 2017 9:27 pm 
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Joined: Tue Jun 02, 2015 2:28 pm
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Really don't care for the cam drive setup they have...Its like loose and floats a lot more than I would like..
Toss it..... keep it??


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PostPosted: Thu May 18, 2017 4:14 am 
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Use a billet steel timing set and double pin the cam gear.

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brent@lykinsmotorsports.com


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