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WD 45 with high pmpression pistons

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Play farmer

01-30-2006 10:02:03

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You all helped me last week now lets try again. I put a flat top high compression piston in my WD with a 45 crank. I turned down the crater top pistons to the same height as the new on. The original starter wont turn it but when I boost it it runs very nice. Is ther an easy way to booost output from the starter? Also, will the engine hold up ok as long as it doesn't ping. I saw a few old posts that said to use high octane fuel but it sounds fine. Whats the best thing todo. I'm not trying to build a puller, but the high compresson piston was the only one the parts house had listed.

Thanks

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Guyzoo

02-05-2006 14:04:29

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Re: WD 45 with high pmpression pistons in reply to Play farmer, 01-30-2006 10:02:03

I would say the brushes in the starter are probably worn out
The same thing happened to me last year. good battery, good cables, bad brushes

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mlpankey

01-31-2006 08:25:19

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Re: WD 45 with high pmpression pistons in reply to Play farmer, 01-30-2006 10:02:03

make some cables out of welding lead add a 12 volt battery . if it still has trouble turning over . then turn motor over with starter first then flip the ignition on after motor is turning good. with higher compression and advanced timing sometimes its the only way . and if its real cold dragg the thing.

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mlpankey

01-31-2006 09:40:15

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Re: WD 45 with high pmpression pistons in reply to mlpankey , 01-31-2006 08:25:19

by the way it takes 950cranking amps and a full charge and sometimes it still melts the lead terminals of the wires if i get in a hurry and light of the ignition first instead of turning over the motor.

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Kent of SW MO

01-31-2006 05:44:55

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Re: WD 45 with high pmpression pistons in reply to Play farmer, 01-30-2006 10:02:03

The WD piston has a lower wrist pin location than the WD-45 piston. When the WD piston is used with the WD-45 crank the WD piston is about 1/4 inch higher in the cylinder at TDC. This results in a smaller area above the piston which increases the compression ratio. This is why your engine is hard to crank. If 12 volts on the 6 volt starter will not crank the engine you could try 24 or 36 volts but you MAY melt MANY things from VERY high current. This IS NOT recommended. You could adapt a larger starter to your WD but that could cost mega-bucks. Your best bet is to remove the WD pistons and install the correct WD-45 pistons. Kent

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mlpankey

01-30-2006 12:05:14

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Re: WD 45 with high pmpression pistons in reply to Play farmer, 01-30-2006 10:02:03

I thought the cylinder heads were flat and the combustion chamber was in the cylinder of all allis chalmers .LERIO is the only head i know of that will fit that has a chamber in the cylinder head

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Texas Denny

01-31-2006 05:26:19

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Re: WD 45 with high pmpression pistons in reply to mlpankey, 01-30-2006 12:05:14

Everyone that I've seen is as you describe. Compression is changed by having the pistions be taller or shorter. It seems to me that this engine should be called a flathead. Actually, Ford flathead heads are not flat!

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Texas Denny

01-30-2006 11:11:10

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Re: WD 45 with high pmpression pistons in reply to Play farmer, 01-30-2006 10:02:03

The WD-45 also came as an LP version. Gasoline had a 6.45:1. LP had 7.2:1. The distillate version was 4.75:1. My guess is that your high compression pistons were LP pistons. Even aftermarket high compression probably were 8.0:1. Regular gas should work fine to 8.5:1. When you approach 9.0:1, the combustion chamber will need a better design than Allis has. A lot of cars are running today at 9.5:1 on regular but with a well designed combustion chamber.

If you are trying to start it with 6 volts, you'll need really good cables - I'd say 0 gauge or 00 gauge. If you switch to 12 volt, use good cables of about 2 guage. The original starter should crank it fine if all the cables are real good and all the connections are very clean. Don't forget the nose of the starter where it goes into the bell housing. Clean is good. Make sure the stud that holds the starter in is clean - no grease. And that this stud turns in freely and seats solidly into the starter. Back off the locking nut until it is in and tight. Then tighten the locking nut.

You shouldn't need anything special with good cables and clean connections. My guess is your pistons should be fine with regular gas. Might worry about the life of the valves if you are close to 8.0:1 and using it hard.

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BushogPapa

01-30-2006 10:26:21

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Re: WD 45 with high pmpression pistons in reply to Play farmer, 01-30-2006 10:02:03

Have you converted to 12 Volt yet..??

Most need to be when a power kit is installed..

12 Volt will not hurt the 6V starter..just don't let it spin very long with no load on the starter.

Ron..

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Play farmer

01-31-2006 09:44:05

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Re: WD 45 with high pmpression pistons in reply to BushogPapa, 01-30-2006 10:26:21

Yes. I have a 12 volt battery. I do not know if the starter is 6 or 12 volt

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mlpankey

02-01-2006 07:50:57

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Re: WD 45 with high pmpression pistons in reply to Play farmer, 01-31-2006 09:44:05

the starter should be a six volt starter .but 12 volts should be allright for it has heavy wire and more windings for the six volt system.

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T. Williams

01-30-2006 10:14:18

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Re: WD 45 with high pmpression pistons in reply to Play farmer, 01-30-2006 10:02:03

First of all, let me say that I'm no expert on Allis Chalmers tractors. I just bought my first one a couple of weeks ago (1952 WD), but I researched the WD's and WD 45's a bunch before taking the plunge. My understanding is that they came with two different compression pistons. The gasoline pistons, or high compression, and the distillate pistons, or low compression. I'm wondering if your "high compression" pistons aren't just the standard gasoline engine pistons and therefor would run just fine with your gasoline?

Maybe somebody will come in and tell me I got it all wrong, but that may be the case here.

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