stroker cranks

[ehp]

I have had a lot of guys asking about strokers for stihl's
first anything can be done if you want to spend enough money but most stihl's are a 2 piece crank . This means the pin and one side of the crank are made from one piece of steel. The otherside is normal so if you want to stroke a stihl you would need to build the side that has the pin in it so you can stroke it. Like i said it can be done but cost alot of money . The 460/ 046 stihl is a 3 piece crank that can be stroked easy .The 084 and 088 are 2 piece cranks

 

[lucky]

tellus more ehp For exmple take the 046. What all is done and how much does it cost. who performs the work? how much power is gained? Sorry about all the questions. Thanks Lucky

 

[066 stihl]

Falicon Crankshafts
Clearwater, Florida

Ph. 727-797-2468

 

[ehp]

yes they do cranks but they are twice as much money as i can have them done here
on strokers you are looking to make more torque which they do.
The muffler class saws are the most type of saw that will gain the most, because torque is what they need.
The 3120 is the most stroked saw outthere, i have stroked other saws but mostly 3120's
On stihl's like the 046 when you stroke it by 4mm ,, so this means you more the pin 2 mm to get a 4mm stroke , you have to change the rod as well because it is to short now and the piston will hit the crank at bottom deadcentre and you will not beable to turn the engine over.
Plus the longer rod helps give you more torque because as the motor turns over the rod doesnot have to be at such a sharp angle with a longer rod , the sharper angle takes more power to turn over and tears the face off the piston on the intake side on racing motors with big ports

 

[titan]

a guy was telling me that to stroke a 3120 it is easier to put a 088 crank in he said it takes a little work to make it fit but you will have better performance

 

[Jacob J.]

Yes, I've heard that also, you have to machine some areas down on the shoulders of the 088 crank but it works and works well. I think you have to modify the wrist pin area as the 088 connecting rod is slightly wider.

 

[ehp]

Thanks Mark
But to be honest most guys i could hand them a saw and they still would not be able to make it work as good .Now i donot mean in any way that my head is as big as a football or that i an god .What i mean is most guys are not carefull enough and what they might think is nothing is life or death to me
now someone like Dozer Dan i believe would be able to copy one of mine because he knows that you have to take your time and do it once and right. I am sure there are others
The carb is like a work of art , one wrong stroke and you are buying a new one to start over, have i scraped a few you bet
no one showed me how to do it so i just figured it out myself now it is not as simple as drilling the jets out because for the top of the line carbs you need to make a whole new high speed side in the carb , this means the jet ,nozzle ,needle and fuel route
on the low side you just need the drill the low side and fuel route.
I think i have 1 carb left that we call a doule pumper. it is a HS carb that has been moddified so much that we take a second carb and machine it so it will be the pump side and it bolts on top of the other carb , we bore the first carb so much that we go threw its part that pumps, now i will tell you guys this ,when you bore your carbs donot touch the low speed hole side , this is a no no, when boring a HS carb you have to offset the carb to make it bigger
my small HS carbs have a bore of .988' , now the 3120 carb stock is 1.062 ' and the small carb will pump the same amount of fuel as the bigger carb

 

[lucky]

Leaches? Marky, dude, settle down. All I did was ask some questions. How will I know if I don't ask? My questions were honest and sincere. I asked out of curiousity and I don't believe there is anything wrong with that. It's only the know-it-all types that don't ask any questions and they are usually full of... well you know. Anyway I'm not going anywhere, and next tiem I get curious, I'll probably ask. Thanks for the reply ehp. Good evening to all. Lucky

 

[ehp]

Titan donot let people fill your head full of ideas
the 3120 crank is alot longer than a 088 crank
3120 crankcase is lot wider than the 088
the clutch is different on how it goes on plus why would you do it for only 1 mm longer stroke
now are sure that they were not talking about the 084 rod
yes we put the 084 rod on the stroked 3120 cranks
you cannot use the 088 rod the pin is bigger
next time you are in the shop take a 3120 crank and put it next to a 088 crank and you will see no way

 

[bwalker]

All I did was ask some questions

Yes, but the questions most people ask are akin to asking KFC for their original recipe. Many people can port cylinders, but it takes alot of time and sweat to arrive at a good set of figures. Asking people like Ed or KD specifics(#'s, etc) of what they are doing to these saws is downright rude in my book.

 

[titan]

stroker

ehp your probobly right you know a lot more about that then i do and maybe i misunderstud himto if it was that easy there would be a lot of people doing it wouldnt they

 

[ehp]

no Titan you most likely heard right
the guy you heard it from was most likely wrong because where you are there are alot of strokers and most of those guys that own the saws donot know what is going on
i even had a guy ask me if i was nutts for wanting so much for a stroker crank when he could just go to a stihl dealer and buy one
but when it told him that i just cut the 084 crank in half took the rod off and threw the rest of his brand new crank in the junk pile
and the rest that is done he started to see why

 

[ehp]

not sure what is going on but my PM will come on trying me i got a new message and then it is gone and i have no message there
whats up with that

 

[ehp]

Titan your p m box is full
could not reply to you
here is your ans. no i have never heard of those marks on a piston but i know they would not be on mine
like we said before he could be a great engine builder but no one has heard of him and now adays it is so easy to find someone out it seems wierd that no one has heard of him
i do shows in Quebec plus i have guys that live in Quebec that race everwhere and have never seen him or seen his saws but he could just blow us away time will tell

 

[lucky]

Yes, but the questions most people ask are akin to asking KFC for their original recipe. Many people can port cylinders, but it takes alot of time and sweat to arrive at a good set of figures. Asking people like Ed or KD specifics(#'s, etc) of what they are doing to these saws is downright rude in my book.

Bwalker: Look, I am a saw user not racer or builder so why would I be looking for secrets? to steal them and sell them on ebay? Come on now. Really. I have far too much pride to steal anyones secrets. Now rude in your book it may be, but to many others it would be perfectly fine.

Lets assume that asking questions of this nature is in fact rude. Then is the customer supposed to pay hard earned money to a person he hasn't even met and then blindly trust the person doing the work? I thought it is usually customary to inquire about a product before you buy. Would you go down to the car dealership, not ask any questions and then say, I think I'll take that one over there. No , I don't care how much it costs, and I don't know a thing about the car but I want that one. We all know that's not likely to happen isn't it?
Most level headed logical consumers will need information in order to make a sound decision. At this point the retailer or service provide must convince the customer to buy the product. This is called advertising. You can't expect me to spend a cent if you do not give some kind of clue as to what I am paying for. Point is that reputation,trust and respect are earned. Not universally but one client/customer at a time. When a retailer has not earned the trust of the customer yet expects trust from the beginning, well that's rude in my book.

ehp, this post was in no way directed towards you. I simply wish to illustrate the basic reasons that we all ask questions before we buy. I sent you the pm. Sorry that you can't read it.

 

[bwalker]

Lucky, re read my post. I wasnt attacking you per se, but the guys who are trying to get port timing numbers from a few of the esteemed builders here. I have had many two cycles motors built and I have never had one of tuners tell me the port timing numbers. Thats not to say they dont inform me of what they are going to do. There is a big differance.

 

[ehp]

You guys are right , you do not know me and i could be just someone that can talk , i know i cannotspell so i guess we will have to say talk
i have been where you are coming from and i ask alot of ? and if he doesnot answer me then i am off and looking for someone else
i know quite a few people that got screwed in my view by saw builders that could talk but not walk the walk
the only way someone is going to learn is to ask ? now right
now i will answer most but if i feel that you are asking to much i will just not answer and i should be able to do that

 

[lucky]

ehp- I am sorry if it seemed as though I was prying, I guess I'm just naturally curious. If saw building is something you guys don't want to type about, I guess it's ok cause there's probably a couple people reading this thread. Thank you for sharing what you have thus far. I as hp enthusiest, I always enjoy conversation about modified engines whether its a hopped up turbodiesel pickup or a antique tractor pull. Gotta love threads like this.

 

[Jacob J.]

Ben - even if a builder gives out some numbers, that doesn't take the place of the real talent that goes into building a quality running engine. or as Ed said, taking the time and effort on a "do or die" job. Lol@stealing builder's secrets- all the info is already out there for anyone who's willing to go get it.

 

[bwalker]

all the info is already out there for anyone who's willing to go get it.

There is info out there. Places like Macdizzy give lots of port timing numbers, but apply these to a saw and it will be a disaster. The trick with building a two cycle is to recognize the interaction between port timing and the type of power curve the machine needs. This is where the testing and sweat come in. To circumvent all the sweat and testing is pretty lame in my book.

BTW the actual porting and machining that is entailed in building a two stroke is easy. Its the above mentioned thats tough.