So, I've just got this '97 Evo softail. But all my friends ride twinkies. The performance difference is not all that great between the two, but I want to make greater.
I have tried to balance the costs, considered a big bore/stroke combination and have semi-decided to go with a simple stock bore stroker. The only logical stroke for this bike is 4.625.
My build parameters:
Screaming Eagle heads (72cc combustion chamber)
9.5:1 CR
4.625 stroke
.040 quench clearance (squish)
Stock CV card with a dynojet Thunderslide kit
I've looked at several camshaft numbers and have a few in mind, am looking for a broad, flat torque curve so will be going wit a cam with a duration of about 240 - 250 and about .500 - .530 lift. for a 89" motor, larger motor, more lift.
Will be replacing the lifters, bearings, bushings, etc in the bottom end; a complete blueprinted <-(vague term, I know) build.
The problem I am having is locating dished, flat top, FORGED stroker pistons for stock bores. The piston is gong to require a fairly deep dish to meet my CR criteria. I want the dish to match the small SE combustion chamber or even be a bit smaller than the chamber. My rudimentary calculations tell me I need about 7.8 cc dish. Moving the piston .005 further from the head would make it 7.0 cc I think the extra .005 would be better spent squishing the mixture into the chamber.
I've crossed S&S off my list although they did answer the email it was a basic "we don;t have what you want" response.
I prefer to go with Truett & Osborne Flywheels but am flexible, I had thought of Jims but they haven;t answered my email and I am not overly fond of the idea of pressed Flywheel assemblies, but could use their pistons if there was enough meat on 'em to dish. Is there anyone with experience with dished pistons like this or know of a shop or vendor that can provide a piston configuration like this that will live?
While I am asking questions; I originally intended to go with Axtell cast Iron 3.8125 barrels, but decided against it due to all the horror stories about Evo Cases; thought the stock bore stroke would be a better idea. I open the thing up I can takes some measurements and decide for my self, build the stroker and get a top end /case combination for later. From what I understand; I've got about the best set of cases going for an Evo, the question of spigot thickness is one that seems to not have a clear answer available anywhere 've looked. (I've read the thread on this forum, and while quite informative it also is vague on the spigot thickness/model year issue). Does anyone have experience with big bore kits like this in stock late model cases? I could sell this '97 and pick up a '99. Right now, I know of two that I can get, if that makes a difference. I would prefer to start from the strongest base I can and build up as pocket book and time allow.
Due to my location, cases and a cylinder kit would probably cost me over $3000 US. Add in the stroker flywheel assembly and the motor starts to eat my Suspension, brake, wheel & tire upgrades; these ,in my opinion, are equal in importance to adding Torque and HP. Where I live there ain't that many straights and you never know when there will be an elephant around the next bend. I figure I can stroke it for half that (S.E. heads are a given no matter what the configuration), then maybe next year I can add the cases and bore kit. but If I could get by without the cases, I could then reduce the stroke (or not) and go with a top end kit.
I've contacted a lot of vendors via email and got very few responses, the folks at T&O have been helpful but have no answer, S&S and KB at least got back to me. I don't mind staying up and calling the U.S. if I've got to go through a list of vendors as long as my arm long transpacific calls can ring up the telephone bill and there goes those flanders #2 bars I've got my eye on...
I have tried to balance the costs, considered a big bore/stroke combination and have semi-decided to go with a simple stock bore stroker. The only logical stroke for this bike is 4.625.
My build parameters:
Screaming Eagle heads (72cc combustion chamber)
9.5:1 CR
4.625 stroke
.040 quench clearance (squish)
Stock CV card with a dynojet Thunderslide kit
I've looked at several camshaft numbers and have a few in mind, am looking for a broad, flat torque curve so will be going wit a cam with a duration of about 240 - 250 and about .500 - .530 lift. for a 89" motor, larger motor, more lift.
Will be replacing the lifters, bearings, bushings, etc in the bottom end; a complete blueprinted <-(vague term, I know) build.
The problem I am having is locating dished, flat top, FORGED stroker pistons for stock bores. The piston is gong to require a fairly deep dish to meet my CR criteria. I want the dish to match the small SE combustion chamber or even be a bit smaller than the chamber. My rudimentary calculations tell me I need about 7.8 cc dish. Moving the piston .005 further from the head would make it 7.0 cc I think the extra .005 would be better spent squishing the mixture into the chamber.
I've crossed S&S off my list although they did answer the email it was a basic "we don;t have what you want" response.
I prefer to go with Truett & Osborne Flywheels but am flexible, I had thought of Jims but they haven;t answered my email and I am not overly fond of the idea of pressed Flywheel assemblies, but could use their pistons if there was enough meat on 'em to dish. Is there anyone with experience with dished pistons like this or know of a shop or vendor that can provide a piston configuration like this that will live?
While I am asking questions; I originally intended to go with Axtell cast Iron 3.8125 barrels, but decided against it due to all the horror stories about Evo Cases; thought the stock bore stroke would be a better idea. I open the thing up I can takes some measurements and decide for my self, build the stroker and get a top end /case combination for later. From what I understand; I've got about the best set of cases going for an Evo, the question of spigot thickness is one that seems to not have a clear answer available anywhere 've looked. (I've read the thread on this forum, and while quite informative it also is vague on the spigot thickness/model year issue). Does anyone have experience with big bore kits like this in stock late model cases? I could sell this '97 and pick up a '99. Right now, I know of two that I can get, if that makes a difference. I would prefer to start from the strongest base I can and build up as pocket book and time allow.
Due to my location, cases and a cylinder kit would probably cost me over $3000 US. Add in the stroker flywheel assembly and the motor starts to eat my Suspension, brake, wheel & tire upgrades; these ,in my opinion, are equal in importance to adding Torque and HP. Where I live there ain't that many straights and you never know when there will be an elephant around the next bend. I figure I can stroke it for half that (S.E. heads are a given no matter what the configuration), then maybe next year I can add the cases and bore kit. but If I could get by without the cases, I could then reduce the stroke (or not) and go with a top end kit.
I've contacted a lot of vendors via email and got very few responses, the folks at T&O have been helpful but have no answer, S&S and KB at least got back to me. I don't mind staying up and calling the U.S. if I've got to go through a list of vendors as long as my arm long transpacific calls can ring up the telephone bill and there goes those flanders #2 bars I've got my eye on...
