D15 puller

Been pulling a series I D15 with a series II engine in it at our local club in 4000 and 4500lb 3mph classes and I am looking for more power. There are a few WC’s and WD’s bored and stroked that are hard to keep up with at times even at 3mph. My question is has anyone ever stroked a d15 engine? Is there even room? Like to stick with the D15 since I already have it set up. Any insight on more power would be appreciated. I should include no turbos are aloud. Thanks for any input.

I never expect to be anywhere in the same ballpark as a WC. But at 3mph just having enough hp to keep the d15 rpm’s up to keep my speed will help I bunch. I don’t expect 70hp out of it. But 55hp would be nice to achieve. That’s all I’m after. I’m well aware a WC is a better puller.

Our club doesn’t have anything smaller than the 4000lb class. So I’m hearing that there is absolutely nothing I can do? I’m good with getting custom work done with the a crank or boring it but I wasn’t sure if there was even room in the block. I saw a guy with a C allis in another post that had some cam work and one up to 170ci.

Your carb is essentially the same as a WD45 and D-17.  With a little work, you could graft a D-19 carb (or one from another tractor in that 65 to 75 HP size) and gain some HP.  Work over your governor and get the engine to hit 2600 to 2800 RPM's and with a larger carb you will notice that. If you advance the ignition timing 5 degrees (to 30 degrees BTDC)  and burn only 90 to 92 octane gas, there is a little bit more HP to be gained there. That particular engine is NOT worth spending $1,000+ in stroking the crankshaft because there ain't that much room to work with.

Edited by DrAllis - 02 Jul 2019 at 7:24am

Wow stock cubic inch engine that makes over 70 hp. Sure there are a few people on here that want to know your secret

No. See that often. Has nothing todo with weight. Just never seen a stock cubic inch 226 make over 70hp

A stock D-17 was rated at 53 PTO HP @1650 RPM with power steering. Removal of the power steering is a 3 HP gain, so now you are at 57 HP @1650 RPM.  Increasing the rated RPM to 1800 will yield you 4 more HP, so now we are at 61 HP at the PTO. Installing 8.0 to 1 pistons and sleeves( or 4 1/8" overbore that actually have good compression) from a 170 or 175 is good for 4 more HP, so that gets us up to 65 HP. More RPM to 2,000 RPM rated speed would probably be 69 HP and then there's a matter of a larger carb assembly from tractors that were rated at 70 or more HP like a D-19. Removal of the belly hydraulic pump should be +2 HP. There is also the 175 camshaft grind that will gain you a few more too.

Edited by DrAllis - 06 Jul 2019 at 5:01pm

Really ??  I'm trying to support your questioning of a completely "stock" D-17 engine really can't do it at an all "stock" configuration .   It takes a few things. You'd never talk to me like that face to face. Pretty brave behind the cloak of the keyboard.  Maybe we can meet up somewhere and have a talk ??

Zads go his panties in a bunch , now where did the good doc say is is completely stock , ie cam , headwork , carb upgrade ect ok and increases rpms will get you the 70hp go with good fuel not cheap pump gas on stock cubic inches ! Read carefully before you spout off , ignorance is bliss they say ! Lol very disrespectful to someone who knows the facts that you obviously do not . And yes we have 2 WD 45 s making 70 hp + on stock cubes and doc didn’t build so it is very possible! You just gotta want it ! Lol

Edited by Acllss puller - 06 Jul 2019 at 7:35pm

Dr Allis is right. I’m at 226 cubic inches. But I’m running good gas, my governor has been tweaked, it’s had some head work done and I’ve played with the timing and carb while on the dyno. That’s what the dyno said. I’ve never personally met dr Allis but from being on this forum and reading the man is smart when it comes to the orange tractors.   Whenever I decide to build a 190 for pulling I’ll be talking to him for help!

Edited by Allisman01 - 07 Jul 2019 at 8:52am

Best of luck to you fellow orange puller! There is a good thing to this, at least is a orange tractor beating you and not a half tractor ( John Deere)!

A Farmall H with a turbo? Sounds like there has been a rule change to allow turbos. Why not advocate for adding a lighter class to swap you D15II engine into a D10 chassis? 

You can bore and stroke to get more power. At that heavy of class you will still be behind in power but closer.