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Stroke ??

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Mike B

01-12-2002 11:21:11




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If you off set grind a crank 1/4" will you gain a !/4" or 1/2" of stroke?




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Bman

01-13-2002 07:15:14




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 Re: Stroke ?? in reply to Mike B, 01-12-2002 11:21:11  
if you do a 1/4inch off set and put the top of the jurnal back to the oreginal place you gain a 1/4 inch on the bottem of the stroke if you do a 1/4 inch strate stroke,moveing the jurnal a 1/4 inch farther out on the throw you gain a 1/2 inch,1/4 inch on top and 1/4 inch on bottom of stroke



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G Taylor

01-12-2002 21:27:00




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 Re: Stroke ?? in reply to Mike B, 01-12-2002 11:21:11  
If 1/4 " dia is cut from the crank throw inside, then the journal centerline is 1/8" "farther out". Stroke is now 1/4 more in total with the piston poking 1/8" higher & lower than before.



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Mike in Mo

01-12-2002 13:50:22




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 Re: Stroke ?? in reply to Mike B, 01-12-2002 11:21:11  
Mike - If you reduce the crankpin diameter by 1/4 inch you will gain 1/4 inch of stroke. Mike



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George in NH

01-12-2002 17:39:38




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 Re: Re: Stroke ?? in reply to Mike in Mo, 01-12-2002 13:50:22  
If you Offset grind 1/4" to increase stroke you will increase piston travel a total of 1/2".
Stroke can be reduced also but you would be moving the in the opposite direction or closer to the crank center(DE-Stroking).
Simply reducing the crankpin diamenter without offsetting will gain you nothing in displacemnt!



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Mike in mo

01-13-2002 10:20:54




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 Re: Re: Re: Stroke ?? in reply to George in NH, 01-12-2002 17:39:38  
Sorry I didn't clarify to offset grind the crankpin to the outside of the origional crankpin, but you will NOT get 1/2" more piston travel, it will be 1/4" more travel. Mike



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dave h

01-13-2002 10:19:06




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 Re: Re: Re: Stroke ?? in reply to George in NH, 01-12-2002 17:39:38  
cost of offset grinds ?



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JDGnut

01-14-2002 15:47:07




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 Re: Re: Re: Re: Stroke ?? in reply to dave h, 01-13-2002 10:19:06  
Usually the cost of the offset grind is not much more than a normal crank grinding.. I price an offset grind for a 2 cylinder Deere.. they wanted just over $100 to grind the journals.. Remember when U offset grind the journals.. .250 U will push the pistons up .125 more and pull the pistons down .125 futher.. Not good for any large CID gain.. but you will add some compression along with the small CID gain... This would work good if you already have the rods with the smaller journals... A cheap way to add some HP.. JDGnut

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dave

01-14-2002 17:05:27




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 Re: Re: Re: Re: Re: Stroke ?? in reply to JDGnut, 01-14-2002 15:47:07  
how would you go about welding the top of the journals. laying continuous beads, filling in the old journal plus twice the distance of the desired stroke increase? What is the most you can do this ? Can I ADD 1'' of total stroke?



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burns

01-14-2002 18:43:19




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 Re: Re: Re: Re: Re: Re: Stroke ?? in reply to dave, 01-14-2002 17:05:27  
Pittsburgh Crankshaft does a submersible form of welding to build up the journal. One of the most critical parts of the journal is the diameter of the fillet on the outside of the journal. When an offset grind is done, often a small cut will be sacrificed on the backside to create a good radius or they will build up the journal with weld. I would be happy with a $100 bill but I was looking a bill three times that amount for an offset grind for my JD G. $$$ per cubic inch starts to go way up.

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luckydog

01-15-2002 06:34:57




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 Re: Re: Re: Re: Re: Re: Re: Stroke ?? in reply to burns, 01-14-2002 18:43:19  
Hi Burns- In your post below ($ per H/P) you stated that you were running a stock crank. $300 for an offset grind dosn"t sound like a stock crank. You said you had nothing to hide. Just wondering. 63H/P with the money you say you spent seems a little much. I have a 51G that I use to pull, pretty fair power, been down the track many times. The heavy classes you pull I wonder if your tracks are different than the ones in n/c Indiana. Not trying to start something, I"m just puzzled?? luckydog

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burns

01-15-2002 08:48:20




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 Re: Re: Re: Re: Re: Re: Re: Re: Stroke ?? in reply to luckydog, 01-15-2002 06:34:57  
My original plan was to run a 6 3/8” slant top piston with the 3/8” offset grind using A rods. I couldn’t justify the cost to gain only 60 +/- cubic in. I scrapped that idea reused my original aluminum pistons with new rings and left my crank stock (other than the little touch up on the rod journals). You may of misunderstand when I mentioned I was looking at a $300 bill.
Which is too much? HP rating or $$$ spent? If you are talking about the money, I opened Pandora’s box with my flat head. I don’t know how many times I asked myself “Where do I stop?” (Half of that $$ is in the head/manifold alone)

I'm sure that our tracks are different. How much I really can't say. I do know that many of our tracks have been built by the orgainization and are using a good clay providing a good bite. What size tire are you using? Believe me that in the 8500# 9500# classes the ol' girl lets out a heck of a bark under a load. Straight pipe gotta love it. :-)

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luckydog

01-15-2002 11:01:47




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Stroke ?? in reply to burns, 01-15-2002 08:48:20  
I did misunderstand, sorry but it was not clear in the last post or the present post. My fault!! We run on some very good red clay or black gumbo, very good bites. Tire size is F/R F151 15.5-38 cut. Some run 14.9 for a little more speed and tire hieght, can see some difference between the two but every track is different were one favors the other. 6500# is about all I can handle,But when I rebuilt-like you-I stoped before serious money was spent!! luckydog

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burns

01-15-2002 12:00:21




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Stroke ?? in reply to luckydog, 01-15-2002 11:01:47  
No mistake on your part. I understand that black gumbo can seperate the pack real easy. What gear are you pulling?

Merfeld/Schooler wanted $700-$800 for the piston/ring/pin set, $80 a hole for the boring, no guarantees on the block handling a .250 over bore without a sonic check of the metal, $50 -$100 for 3 A rods, $75 to lengthen the rods to achieve the Comp. Ratio. Holy smokes for another $1000 you can get the stroker crank and be done with it. But to spend $1200 for only 60 cubes and maybe 75hp tops. It's a tuff sale.

Isn't it odd that your money tree dies when one gets married??

Drop me an email if you want to talk more.

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dave

01-15-2002 14:53:02




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Stroke ?? in reply to burns, 01-15-2002 12:00:21  
you think getting married kills a hobby, add three daughters , and a new house. had plans on a 403 cube f-20 motor all lined up, till I did my taxes. uncle Sam got that



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dave

01-14-2002 19:01:37




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 Re: Re: Re: Re: Re: Re: Re: Stroke ?? in reply to burns, 01-14-2002 18:43:19  
I have checked with merfelds. I asked about a one inch gain, said not to bother go for the 2'' and spend 1100$$. not to mention all the other changes that goes with that. so anything uder 500$$ for a 1'' offset and grind would be in the ballpark.



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burns

01-14-2002 19:37:34




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 Re: Re: Re: Re: Re: Re: Re: Re: Stroke ?? in reply to dave, 01-14-2002 19:01:37  
Yeah, anymore it doesn't pay unless you are going big. Good talking to ya.



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JDGnut

01-16-2002 11:00:04




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Stroke ?? in reply to burns, 01-14-2002 19:37:34  
The main reason I mentioned the offset grind is because I knew what tractor he was talking about.. A Ollie 77 with 2 in jounrals.. a Super 77 has 2.250 journals.. He has both cranks..

Burns.. the cost of the offset gind would not really have been that expensive if you at not wanted to change to the angle cut pistons.. But I think you would be happier with what U did rather than use the offset grind and a styled head... Everyone has there opinions... The price of $100 was just for the Rod journals.. and U know how they can be... the price be higher when U go to pick up the parts... The G is going together.. but very Slow... later
JDGnut

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