Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Discussion Forum
:

Camshafts for 47 JD A

Welcome Guest, Log in or Register
Author 
Jim Jones

08-27-2002 18:21:43




Report to Moderator

This is my first year for pulling the A-I am rebuilding the engine after the pulling season is over,alredy picked up .125 over pistons,plan on porting the heads,along with 3 way cut of the valve seats.Need to get info on cams,high lift?more duration?.haven't much luck cruising the net.




[Log in to Reply]   [No Email]
SEAMO

08-28-2002 18:49:20




Report to Moderator
 Re: camshafts for 47 JD A in reply to Jim Jones, 08-27-2002 18:21:43  
Jim, If you take your cyl head to the shop for bigger valves make sure they know you can't put valve seats in the head also . If they try it you will be getting into the water jacket under the seats . Believe me I know I bought the man a different head 25yrs ago. Earl



[Log in to Reply]  [No Email]
Jim

08-28-2002 19:13:28




Report to Moderator
 Re: Re: camshafts for 47 JD A in reply to SEAMO, 08-28-2002 18:49:20  
Problebly should stick with o.e.m. valves,go with a 3 way cut- and look at camshaft options.What about porting the head?will i run into the water passeges. G man notes that i should look at upstream air options?thinner air cleaner oil,no oil,or a dry type air filter system.



[Log in to Reply]  [No Email]
G Taylor

08-28-2002 12:01:12




Report to Moderator
 Re: camshafts for 47 JD A in reply to Jim Jones, 08-27-2002 18:21:43  
Green Magazine is full of ads with the items you want. The 47 and later A used the same cam profile as the 60,620 and 630. Work on smoothing out casting flash and edges out of the valve bowls and seat edges. Back cutting the valves improves low lift flow. 125 over pistons make no measurable power than 45 or 90 over pistons. Getting into power block bore sizes will however make extra HP. A stroker crank makes power but the head ports/entire intake system/valves and entire exhaust sysytem work is required. Even if bored and stroked to max it's still HP restricted by only breathing through a straw.

[Log in to Reply]  [No Email]
Jim

08-28-2002 19:31:39




Report to Moderator
 Re: Re: camshafts for 47 JD A in reply to G Taylor, 08-28-2002 12:01:12  
G Taylor,Thanks for the info.What part of the straw would you change? The smallest part i see is the ventury in the carb.



[Log in to Reply]  [No Email]
G Taylor

08-28-2002 21:26:09




Report to Moderator
 Re: Re: Re: camshafts for 47 JD A in reply to Jim, 08-28-2002 19:31:39  
The air flowing straight through the venture without turbulence is of little concern. Turns make turbulence = less flow. Plus a strong booster signal when lugged down is more important than a couple of HP at max rpm. Leave the ports pretty much alone except matching the manifolds to the head. Flow through the valve is the restriction and everything 1 inch in front of the valve seat to 1/2 an inch past is vital. The oilbath aircleaner is restrictive even if clean and thin oil is used. Getting the cam and lifters trued up to stock specs is money well spent on any rebuild but rarely done More compression will make more power until detonation occurs.Then power drops and parts break. Unless you have $10,000 US to play with just open up the aircleaner and exhaust. Tune timing and mixture for max torque when lugged down on a dyno. Pull in 1st or 2nd gear, get the weight balanced correctly and purchase only the best legal hard biting tires available at any price.

[Log in to Reply]  [No Email]
Jim

08-29-2002 08:59:23




Report to Moderator
 Re: Re: Re: Re: camshafts for 47 JD A in reply to G Taylor, 08-28-2002 21:26:09  
G-Taylor----- -I am running 3"straight pipe,not from manifold,but from top of radiator out.do plan on making the lower pipe larger. What about the air cleaner,just pull out the mesh? or both oil and mesh and suck the air from the stack.



[Log in to Reply]  [No Email]
mike

08-28-2002 05:30:41




Report to Moderator
 Re: camshafts for 47 JD A in reply to Jim Jones, 08-27-2002 18:21:43  
The 3 way cut valves won't help much. Just put a bigger valve in to let more air-fuel mix in to the cylinder.



[Log in to Reply]  [No Email]
Jim

08-28-2002 09:54:52




Report to Moderator
 Re: Re: camshafts for 47 JD A in reply to mike, 08-28-2002 05:30:41  
Are the seats,inserts,or part of the cylinder head? Should the exhaust valve be changed as well. I was reading an artical befor,somebody said you could use 720 valves?but need to make the stem shorter and cut a grove for the keeper.



[Log in to Reply]  [No Email]
G-MAN

08-28-2002 13:05:04




Report to Moderator
 Re: Re: Re: camshafts for 47 JD A in reply to Jim, 08-28-2002 09:54:52  
The seats are more than likely machined into the head casting, rather than inserts, unless somebody installed inserts at one time. If you have the head at the machine shop anyway, inserts aren't a bad idea - relatively cheap insurance and you don't have to worry about them after that, regardless of load, fuel type etc. The three angle valve job is a good idea. It will improve flow very marginally, but is a good idea because it will offer improved sealing and extend the life of the valves and seats. Also make sure your valve-to-guide clearance is well within spec, as looseness here can translate to poor performance. The bigger valves are a good idea, but like G Taylor mentioned, you will have to open up the ports, manifold and maybe do some carb work to see a marked improvement. You have to take into consideration all the components the air flows through before it ever gets to the valves.

[Log in to Reply]  [No Email]
Jim

08-28-2002 19:44:41




Report to Moderator
 Re: Re: Re: Re: camshafts for 47 JD A in reply to G-MAN, 08-28-2002 13:05:04  
G MAN Thanks for the info.At the tractor pulls i see a lot of air cleaners just plain removed,which i think is realy stupid if your going to tie up some bucks in a engine-dirt is the worst enimy for any engine,what chenges would you do.



[Log in to Reply]  [No Email]
G-MAN

08-29-2002 05:39:44




Report to Moderator
 Re: Re: Re: Re: Re: camshafts for 47 JD A in reply to Jim, 08-28-2002 19:44:41  
As far as the air cleaner goes, I believe I'm going to run the stock oil-bath on my tractor. From the majority of what I've read on this site, it takes a very big paper element to flow enough air for a "G" - especially if the aif filter is mounted right on the carb, as you so often see. Those engines take a lot of air very quickly, as both cylinders are filling 180 degrees apart. The other things I'm doing to my '48 "G" are: .125 over Arias pistons with higher compression, offset-ground crank running "A" rods, Robert's carb - my tractor didn't have the 51 on it, so I'm going to have him modify the gas "A" carb that was, gas manifold, electronic ignition, camshaft and lifters redone, hardened seats and probably new valve guides and/or valves, and maybe a little head work - port matching and just smooothing the ports as G Taylor mentioned. I might shave the block some, but I'm not going to get too carried away on compression, as the tractor will probably see more play time than pulling time. I'm also planning on installing a Crum 3 inch exhaust pipe and stacks. Nothing real fancy overall, but I'd like to get in the neighborhood of 60-65 hp out of it. Hopefully, with access to a dyno and some tweaking, I can get it. The project is taking longer than I planned, but I'm finally getting the basic tractor together and I should be starting on the engine work soon.

[Log in to Reply]  [No Email]
jim

08-29-2002 08:44:07




Report to Moderator
 Re: Re: Re: Re: Re: Re: camshafts for 47 JD A in reply to G-MAN, 08-29-2002 05:39:44  
G_MAN----- I plan on decking the block,not shaving the head,just making it flat.haven't had the engine apart to find out how much to deck the block Your going to use 3"exhaust pipe,wont the exhaust manifold restrict the exaust rendering the 3" pipe back to 2 1/2"? Also may 47A is a gas burner with the dltx71 carb-i went through it last year,cleaned the little holes with a torch tip cleaner aslo took the main jet out to clean the small holes in it-the carb does pull down very well while pulling

[Log in to Reply]  [No Email]
G-MAN

08-30-2002 07:49:29




Report to Moderator
 Re: Re: Re: Re: Re: Re: Re: camshafts for 47 JD A in reply to jim, 08-29-2002 08:44:07  
Jim, I asked Steve Crum the same question, and he said that the way he manufactures the pipe, it will be true 3 inch exhaust. I haven't seen the parts yet, but I'm pretty sure he knows what he's talking about. If it looks like it will be a problem, I'll probably use a die grinder and open up the end of the manifold some. I also haven't yet decided if I'm going to us a JD gas manifold or get one from Jerrys.

[Log in to Reply]  [No Email]
jim

08-29-2002 08:43:46




Report to Moderator
 Re: Re: Re: Re: Re: Re: camshafts for 47 JD A in reply to G-MAN, 08-29-2002 05:39:44  
G_MAN----- I plan on decking the block,not shaving the head,just making it flat.haven't had the engine apart to find out how much to deck the block Your going to use 3"exhaust pipe,wont the exhaust manifold restrict the exaust rendering the 3" pipe back to 2 1/2"? Also may 47A is a gas burner with the dltx71 carb-i went through it last year,cleaned the little holes with a torch tip cleaner aslo took the main jet out to clean the small holes in it-the carb does pull down very well while pulling

[Log in to Reply]  [No Email]
G-MAN

08-28-2002 13:05:00




Report to Moderator
 Re: Re: Re: camshafts for 47 JD A in reply to Jim, 08-28-2002 09:54:52  
The seats are more than likely machined into the head casting, rather than inserts, unless somebody installed inserts at one time. If you have the head at the machine shop anyway, inserts aren't a bad idea - relatively cheap insurance and you don't have to worry about them after that, regardless of load, fuel type etc. The three angle valve job is a good idea. It will improve flow very marginally, but is a good idea because it will offer improved sealing and extend the life of the valves and seats. Also make sure your valve-to-guide clearance is well within spec, as looseness here can translate to poor performance. The bigger valves are a good idea, but like G Taylor mentioned, you will have to open up the ports, manifold and maybe do some carb work to see a marked improvement. You have to take into consideration all the components the air flows through before it ever gets to the valves.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy