Wd45 engine

[44 standard]

What are the differences between the WD45 engine and a 170 ?
And the later Combine gas 4 cylinder
Looking for hP, in a stock puller

 

[DrAllis]

(quoted from post at 10:09:34 12/21/22) What are the differences between the WD45 engine and a 170 ?
And the later Combine gas 4 cylinder
Looking for hP, in a stock puller

**** How much HP the W-226 or G-226 engine put out depends on the compression ratio and RPM. The manifolds, camshaft grind, valves, and carburetor are the SAME. A stock WD-45 engine produces 60 HP at 1800 RPM full load. A D-17 engine produces 67 HP at 1800 RPM full load. A One-Seventy engine is even more compression and I think would probably produce 71 HP at 1800 RPM. These HP numbers are FLYWHEEL HP, which means no generator or fan spinning. All Gleaner model "E" combines are D-17 engines. Gleaner E-3 would be more like the One-Seventy with higher compression. WD-45's are 6.5 to 1 compression ratio 125 psi cranking pressure. D-17 engines are 7.25 to 1 compression with 145 psi cranking pressure. One-Seventy's are 8.0 to 1 compression with 170 psi cranking pressure. I've got a D-17 puller that would dyno 120 HP at the flywheel, but it has had some pretty extensive things done to it internally.

This post was edited by DrAllis on 12/21/2022 at 05:15 pm.

 

[44 standard]

What was done to boost the compression on the 170 ?

What gains can you expect to see with 1/8 over kit flat top

Is there a need to increase valve size how much cam work is needed to get to the 80-85 hp range

 

[jvin248]

(quoted from post at 20:39:09 12/21/22). .
... I've got a D-17 puller that would dyno 120 HP at the flywheel, but it has had some pretty extensive things done to it internally.

You got me all curious now, lol !

 

[DrAllis]

(quoted from post at 11:40:58 12/22/22) What was done to boost the compression on the 170 ?

What gains can you expect to see with 1/8 over kit flat top

Is there a need to increase valve size how much cam work is needed to get to the 80-85 hp range? ***** Compression was raised on 170 pistons by drilling the piston pin hole a little lower in a D-17 piston. A 175 piston pin is again a little bit lower than a 170 piston. I can tell you this with great certainty.....MOST 4 1/8" bore piston/sleeve kits for A-C engines are very low compression, like 6.5 to 1 the same as a WD45. You will be sorely disappointed. If you can't come up with anything at least 8.0 to 1, you are wasting your time. My original engine (from 40 years ago) was 4 1/8" bore and would crank test at 240 psi. I always called that 11 to 1 compression ratio and it REQUIRED 106 octane gas to run right. I had a 175 grind camshaft and a D-19 sized carb and it would make 85 HP @ 2,000 RPM at the PTO. SO many new pullers (usually) don't understand what they are asking. Horsepower is directly related to what RPM's you are allowed to run !!! and MOST antique pulling clubs have some RPM limits !!! If I was going to build another beginner engine for myself ( or grandsons), I would source some new 4 1/8" bore sleeves, buy a set of 4 1/8" BBChevy pistons spec'd to the compression height I wanted to make this all happen. A 175 cam grind works well too as is easy to come by. As far as valves go?? 30 yrs ago one winter, I built two nearly identical engines of 4 5/8" bores and 5 3/8" stroke ( 360 cubes). One had big valves (customer already had done this to his head) and the other with stock valves and intake guides shortened on the bottom. Both had identical carbs. On the dyno, I saw virtually no difference in HP !! and I would bet the small valve engine would lug down to a stall better than the big valve engine. Also of important note: whenever compression is raised, you need to retard the timing and use much better gas. Timing on 12 or 13 to 1 compression engines will need to be down around 20 degrees BTDC at 2,000 RPM, not 25 degrees and surely not 30 degrees BTDC.

This post was edited by DrAllis on 12/22/2022 at 04:15 pm.