Archive through September 26, 2008

[cgbusch]

Bruce, thanks for posting the PDF. I found it very interesting.
I googled around and found this:
http://ramchargercentral.com/index.php?topic=14833.0
It discusses why porting loses power.

I suspect that for the hotrod Kohler, the biggest change was the cam. His cam probably changed the power band by transfering low end torque to high rpm power.
Back in the day for cars, they'd sell square cams in which the grind was the same for the intake and exhaust and they'd transfer the power to the upper rpm range. However, they idled really poorly from the loss of vacuum. But they had that cool idle sound. Later they realized those grinds weren't producing good power, so they developed better cam grinds. But the better cam grinds didn't produce a cool sounding idle. So what did they do, they re-introduced the square grinds for the poorer but neater sounding idle.

So my basic concern is, does that hotrod Kohler actually dyno to more power or does it just sound good???

 

[bnolte]

I really didn't do any serious polishing, just mostly smoothed out the nibs in the sand casting on the inside of the intake port with a rough stone. I decided to leave the cam stock for the reasons you stated about driveability and mid range torque. I intend the tractor to be used primarily as a snowplow, perhaps I might make it into a backup mower as well if I can piece 2 decks into one good one, and maybe mess around doing stock class pulling, though a K301 might be a better motor to build up for that.

Anyway, I'll see how she runs. I've never really had a Cub 102 with a more or less properly rebuilt motor, let alone one that's been hot rodded a bit. The old 102 has always had motors that have been patched together even though they're worn beyond the wear limits of the block

 

[tmarkle]

Anyone know a source for the screen material used on the NF clutch shields and the uderframe screen for the 82 series? I think the upper grille on the QLs is about the same material too.
I don't want to buy a 4X8 sheet. I have a custom project in mind.
I didn't find anything from Mcmaster-Carr.

 

[aschumacher]

Todd, some of the BigBox stores have sheets of aluminum with various patterns that are 3x3 0r 4x4 ft pieces.

 

[aschumacher]

Don T. & Frank, put life jackets on your Cubs. Something ugley headed your way !

 

[dtanner]

Just a note to say the wind has picked up here in Nova Scotia,( hope we don`t blow away).the rain is heavy at times, i hope some of you got to use your Cubs today. I have all my Cubs under cover now.the 14 k rebuild is coming along with just the breather and carb to be installed and put in the 149 this week. Have a great night, Later Don T

 

[fcurrier]

Don: Toldja!

 

[kwarwick]

Hi Guys.Thought I should post a pic of my cub 1200 I built into a puller last year.He's pulled for 2 seasons now and still runs great.A 126 stock is also in the works right now.Have a great day.K.W.

 

[bchalk]

Brendan, Sierra uses the same type material for the 7 hp. Thats what i ended up putting on my 73. haven't run it yet though, seems PO was having trouble keeping head gaskets to stay put. let us know how it does.

 

[bbrigham]

No problem Brad, I'll let ya know how I make out. So far it seems to be ok. I ran it for a few hours on Saturday after I re-torqued it. It cought me by surprise as I haven't run into that kind of gasket before. I think most of the head gasket problems are from warped heads. I have a total of 2 hours into flattening that one, 1/2 hour more on Saturday morning. That was due to some po dressing the head with a grinder though. It was in real bad shape on the side around the exhaust valve. There were grinder marks all over and it was cut down real bad into the combustion area. It was ground down a good 1/16" if not more. It was one of those I should have had pictures of, it was bad. I don't expect and problems though. I have a certified surface plate that I straighten my heads on and haven't had any problems yet.