Gleaner E Engine Adice

 

Thanks, Jim

for example 17 42985M the "M" is 7.25:1. If it has 17 72985Z the "Z" indicates

8:00:1. The biggest holdback is the .260 cam lift and the out of tolerance rocker arms

and pushrods getting worn. One real easy way if you have the "Z" code engine is to purchase a set of roller rockers. Murphy's make a set in a 1.850" ratio and the

stock rockers measure 1.488 at best. With the Murphy's rocker you actually get more

lift than the 175 cam made, however the critical cam timing events are not as good as

the 175 cam. I think Mitch measured a bunch of his rockers and found some as

bad as 1.42. I've got a set of high compression WC/WD pistons but they will require

a flycut for the valve reliefs unless your rockers measure 1.44 or worse then they just

might clear. They would be around 10:5:1 with your crank. What are you guys using

for a compressed head gasket thickness when figuring compression?

 

 I flowed some of my 4" heads a few years ago and I thought they flowed suprisingly well. Seems like the numbers were good enough to make power to 4500 RPM's on 226 cu inches and that was with the stock valves. That and the Nebraska test results for the

226 engine. The 1957 D17 with the "M" code 7.25:1 engine made 52.70 horsepower. It had a 1" size carb and ran at 1650RPM's.  10 years later they test the 170 gas tractor with the "Z" code 8.00:1 engine, increase the carb to 1-1/8" and raise the RPM's 150 to 1800 and only make 54.12 horsepower. Eight years later the bring the 175 with the "V" code engine @ 8.25:1 compression or only 1/4 point more than the 170, and it makes 60.88 horsepower. Now how did they find all of that increase when the kept the same RPM, 1800? They found it in the camshaft the 1/4 point of compression gain isn't going to be worth 1/2 a horsepower gain over the 170. Granted they increased the carb another 1/8" to 1-1/4" but most of the gain was in the cam. The .260" lift cam was probably a great choice for the WD45 with it 6:5:1 compression ratio running at 1400RPM's. So why didn't they put the good cam in the 170 and make 60 horsepower with it? The answer is the Perkins diesel was only able to develop 52 horsepower and I'm sure marketing wanted to keep them the same. Actually when you look at the tests even further the 170 gas was set really conservatively as it with the bigger carb burned less fuel than the D17 gas. The D17 burned 4.535 gal per hour at max rated load and the 170 burned 4.348 gal per hour @ max load and only 3.986 gal per hour @ the 1650 RPM's the D17 engine was turning. One other thing is the "Z" code gleaner engines actually use an even larger 1-3/16" carb and it's a Schebler not a Zenith like they used on the 170's.

Bob I would check with Barney on that, more than likely it's not going to help to

increase lift a bunch more without increasing your compression ratio. I think your

next step would be to pull the heads and do at least a 3 angle or 5 angle valve job

and use some good undercut stem stainless steel valves. I would go to the 11/32"

stems also we have 3/8" stock. While your in there measure your stock rockers and

make sure they are up to spec. Years ago my best frend and I raced NHRA stock eliminator and we used to go thru two (5) gallon pails of rocker arms just to find (16)

good ones to run in that engine. How much power do you think you have today with

just the Barney cam?

Jim