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60 vs A

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JD60

08-07-2002 19:46:39




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My dad had an A, and I have a 60....why do they sound so different..the A seemed to pop hard every few revs or so, the 60 seems to hit'em all evenly..what causes the difference???
JD60




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KEN

08-07-2002 20:23:10




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 Re: 60 vs A in reply to JD60, 08-07-2002 19:46:39  
I have a 60 and an A.The 60 does run smoother than the A.I think most of it is in the carburation.The 60 has a two barrell carb and intake with an idle adjustment on each barrell so you can adjust each cylinder more precise.The A has a one barrell carb, maybe won't adjust as fine.Also depends on the year A you are talking about.Early A tractors had flat heads, and magnetoes which may not run as smooth as a distributors.And they sure had a different sound. Different compression ratios for all fuel and gas engines also change sound.Just my thoughts.

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JD60

08-07-2002 21:04:28




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 Re: Re: 60 vs A in reply to KEN, 08-07-2002 20:23:10  
interesting...I have read somewhere typical HP for a production A is around 25HP, and 46HP for a std production 60....also read where both are 302 cubic in. displacement engines..60 has the ability to run higher rpm's...does this sound right with you guys??? also I read 620 has ~56Hp
JD60



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David Ransom

08-07-2002 21:14:34




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 Re: Re: Re: 60 vs A in reply to JD60, 08-07-2002 21:04:28  
www.tractortips.com rates the A at 39hp, the 60 at 42, the 620 at 49, and the 630 at 52. The Super H is rated at only 33.



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Bob

08-08-2002 08:57:26




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 Re: Re: Re: Re: 60 vs A in reply to David Ransom, 08-07-2002 21:14:34  
That 39hp for an A is the belt rating on the 1947 and later gas-only version, which had higher compression pistons and could not be run on kero. The kero version was down around 29 belt and 25 drawbar, if I remember correctly.



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G Taylor

08-07-2002 21:24:29




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 Re: Re: Re: Re: 60 vs A in reply to David Ransom, 08-07-2002 21:14:34  
The 630 was never tested at Nebraska as the engine is identical to the 620's.



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Tyler, MO

08-07-2002 20:09:41




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 Re: 60 vs A in reply to JD60, 08-07-2002 19:46:39  
I would say the carb is the difference. The A had a one barrel carb for two cylinders. The 60 had a 2 barrel carb. It is possible to more finely tune a 60 than an A. Im no expert but I think that is probably the biggest reason why you noticed the difference in sound.



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Steve II JD A 44

08-07-2002 20:09:23




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 Re: 60 vs A in reply to JD60, 08-07-2002 19:46:39  
the different I know is the CAM is different.
in the 60 it has alot power. if you move a cam out of a 60 to a A will make it sound same as 60.
that's my guess.



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G Taylor....cam is the same

08-07-2002 21:21:40




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 Re: Re: 60 vs A in reply to Steve II JD A 44, 08-07-2002 20:09:23  
Steve, I don't know who is feeding you all the inaccurate cam info.Purchase the info and look it up yourself if you don't believe me. The cam for all 60's is part number "A 3583R". The AR and AO after serial number 270616 ( mid 1948) cam part number is ..... ..guess what "A 3583 R". The factory replacement cam for A's way back to serial number 424025 or 1936 and later is guess again is..... "A 3583R" Production "A's" from serial number 620324 (mid 1948) had the guess again..... "A 3583R" cam installed from the factory. What is it about part number A 3583R and it's modest specs of intake 10 aTDC/40 aBDC and exhaust 45 bBDC/5 aTDC with .4356" of valve lift is so hard to believe?

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JD60

08-07-2002 21:44:56




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 Re: Re: Re: 60 vs A in reply to G Taylor....cam is the same , 08-07-2002 21:21:40  
Fair enough...I haven't had the opportunity to see an A, 60 , and 620 lined up right next to each other...hope this isn't a stupid question. Are those tractors the same length?? The A looks a little taller and longer..or is it just me, and I need to get out to more shows..I'm just a beginner, my dad had an A while I was growing up...although when I was checking around before buying the 60 I have now, I checked out a 620 it was definitly taller, maybe its just the back wheel/tire size....any comments..then I better go to bed its 12:52 am ...
Thanks!!!!! JD60

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David Ransom (probably not much help)

08-07-2002 22:10:59




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 Re: Re: Re: Re: 60 vs A in reply to JD60, 08-07-2002 21:44:56  
My grandmother has a 1947 or 1948 (?) A-shaped piece of rust. I haven't measured it, but the rear tires are 38s.

This probably won't be of much help.



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AC

08-08-2002 06:19:41




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 Re: Re: Re: Re: Re: 60 vs A in reply to David Ransom (probably not much help), 08-07-2002 22:10:59  
I thought the mag ignition on the A fired on the exhaust stroke too...that wouldn't let it idle evenly....just a thought...



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G-MAN

08-08-2002 10:26:15




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 Re: Re: Re: Re: Re: Re: 60 vs A in reply to AC, 08-08-2002 06:19:41  
The reason that single barrel carbureted two-cylinders is that the intake strokes are only 180 degrees apart for the two cylinders, which generally results in the #1 cylinder getting a richer mixture and the #2 cylinder getting a leaner mixture at the low air flows at idle. As engine speed increases, airflow speeds up and the engine will smooth out and run better. The duplex carburetion eliminated a lot of this problem by basically providing a separate carb for each cylinder.

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Rodney A. Johnson

08-09-2002 10:22:19




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 Re: Re: Re: Re: Re: Re: Re: 60 vs A in reply to G-MAN, 08-08-2002 10:26:15  
FWiW, an old 2 cylinder mechanic told my dad years ago that the secret to getting the 2 bangers to run smoother was to put a hotter plug in the cylinder that fired second (if you weren't going to work it hard). By doing this, the gas would burn more completely so you couldn't really tell which cylinder was firing just by ear. This change is most noticeable at idle. My dad's '52 G ran a very low RPMs as smooth as can be.

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