Deere G ..several questions

Also, I am not a serious puller or for that matter much of a puller at all. I just want the tractor to run as well as possible given the hand it has been dealt.

The questions:

1) I am running 22BTC timing. In your opinions, is that about right? I run 87 or 89 octane straight gas.

2) Has anyone retrofitted a K&N filter into the existing air cleaner housing?

3) My exhaust manifold has the web that bisects the flow path in the exhaust stream. What functions does it serve and should I remove it?

4) I don't have a reground cam. I read something about Murphy rocker arms. Is this a good step to improve port flow given the stock cam?

5) Given the above, does it make any sense to go for a Dengler's cold manifold?

6) Given my current situation, about how much power at the PTO should I be running?

Thank you for your time,

Rob

OK! Maybe I did miss the standard plug for the Magic Miracle Monster governor spring; but it was still very nice. Enjoy the day Gents. best, Phil

"...rational, coherert, intelligent"...that's us.

Thanks for the indulgence and patience!

Regards,
Rob

Sounds like your baby is a lot like mine except I wasn't quite as bold with the head decking. I have the '51 carb though but is sounds from other posts that the DLTX51 is probably oversize for a gas burning G. I guess I get concerned about instantaneous flow capability as you're at peak intake air mass flow for a pretty small percentage of the firing cycle. One would have thought that the K&N would have given you some benefit especially since such a short flow path was provided.

I gotta think about the Murphy rockers a bit but since this is my only antique tractor, if the boss says there's a couple quid in the checking account, I will be tempted to pull the trigger.

I'm thinking I'm at around 53 hp now, but test results talk and BS walks so I need to get confirmation.

I like to plow too, more so than pulling. Probably because with 13.6.38's, I spin out in second gear on the local track (6500#).

Thanks,
Rob

Yeah, I like to plow, always have. Adequate instantaneous intake air mass flow versus average is a whole 'nother issue. You have only two easy options, either make sure you've got an accumulator in place that can supply the cylinders with enough air for two complete air charges or have a really free-flowing (oversized) dry filter. My current idea is to investigate removing the the innards of the wet air cleaner and put a K&N inside the existing wet air filter space. Some trimming of the air pipe coming down the inside of the housing is anticipated. I will have to be careful to ensure that sufficient flow area exists everywhere but right now, I think it's doable. I hope to be able to put the bottom cover/cup back on so it is a clean installation.

Am I nuts or does this have a chance?

Thanks,
Rob

I think we are talking about the same basic approach on the retrofit of a wet air cleaner to a K&N. Sure sounds like it.

Rob

Howard

It's been awhile since I bought them. Beautiful pieces of work. No shortcuts. If you look down the intake pipe, on the inertial separator cap, it is mirror polished and actually enscribed! I'm thinking $300 for the set but again, it's been several years. I threw a lot at the old girl at the time...new high comps and bearings, new intake and exh.valves, completely reworked the head, polished and modestly ported it and the manifold and went through the carb. So, yeah, it sure did wake up but exactly how much each component gave me is unfortunately anyone's guess.

If $$ isn't too much of an object, I'd speak w/ Mr. Crum and make a purchase. The unmuffled sound of the tractor alone is worth the cash.

Good luck,
Rob

Tx,
Rob

Thanks,
Rob

Thanks for the insights. I agree wholeheartedly with your assessment of Mr. Crum's handiwork, as my reply to hHoward attests to. My G does a little of everything and what I am trying to do is to have a healthy plowing rig that won'tembarrass itself (I personally am pretty welll beyond embarassment)at a tractor pull with its peers. I will stick with the 0.020 lash and not worry about trying to get the last 5% out of the new rockers.

Any thoughts on ignition timing?

Many thanks,
Rob

I did what I thought was a pretty decent job of lining TDC up relative to the punch mark. Not perfect, I'm sure. Then I measured the circumference of the flywheel and marked degree points at what I thought might be a decent range of timing values. Right now, I am at 22BTC, probably +/- 1-2 degrees. I use a timimg light for timing. I listen for the tractor to even out in cadence at close to high idle, then retard it about 5 degrees. I figure that once it evens out nicely, I 'm doing nontrivial negative work (too much cylinder pressure BTC). I have convinced myself, completely in the absence of hard evidence, that 5 degrees retard helps keep the real work on the right side of TDC and presumably increases power output. You and the rest of the guys that actually know what you're doing likely see this as amateurish, and it is, but I am using what few tools I have. An hour on a dyno would work wonders!

Mine wasn't a case-up deal by any stretch but it was/is pretty complete insofar as the power unit is concerned. The rest of the tractor is in pretty good shape so I'll probably fix as I go along.

My email is robecca78@yahoo.com. I might be able to be more conversant on the topic of plowing tractors than pullers and I'd like to hear about the 60. We had one once upon a time. Good old tractor. I spent tons of time on 730 diesels as well.

Take care and thanks,
Rob

Sounds like a pretty stout tractor. I'm getting the impression that the colder the manifold, the better, to a point, of course.

How about the web on the exhaust side of my F1074 manifold? Should I remove it or does it serve a valuable purpose (better structure or better flow)?

Thanks,
Rob

Thanks again. You gotta be careful with hot spots, I agree, so any modification I make will be limited to smoothing the leading edge of the web.

This is way out of my league so I'm just gonna toss it out as an idea but has anyone ever tried to make a precombustion chamber and adapt it to one of Jerry's heads? I would think that the combustion would be vastly improved, specifically as it involves detonation margin. PC's on big, quiescent chambers like a G are really wonderful.

Just a thought.

Regards,
Rob