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- Опубликовано: 21 авг 2018
- 20180821190218 1
#115 1978 93ci stroker shovelhead big bore motor new bike build fl harley by tatro machine
what do you do when you want to keep dads old bike but you want to update it to be more reliable and fun to ride. watch the videos and see what we do to make the customer happy.
tatro 
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After Watching Your Engine Builds if i Was Going To Do a Rebuild i Would Use altima Now After Seeing You Do Engines with S&S There Parts Were Good Back in The Day But Now That You Show How Bad There Lower End Parts Are i Would Not Buy It Any More i Have Watch You Take There Lower End Sit Up Apart on Every Build You Do Thanks
s&s wheels, accel shafts, jims nuts, panhead bearings and h-beam rods are the best. but you have to make this one.
tatro
kool vid ... was wondering have to do a gasket change on a 1982 iron head was wondering what would you set the torque spec number to tighten the top bolts down ... †
head bolts are around 60 or so. just make them tight. you have to learn what that is for every size.
tatro
Hate those bearings on the big end of rod. Shit
Wait a minute, won't the engine oil make up for the one thou of extra clearance ? Or does that only pertain to bushings or plain bearings ?
extra clearance is what it says, extra. plus it is not just extra clearance, it is out of round and tapered too. oil is not designed to be a filler material, it's job is to stop metal to metal contact.
tatro
I know it is kinda randomly asking but do anybody know a good site to watch newly released movies online?
@Bishop Musa flixportal xD
@Rylan Emery Thank you, signed up and it seems like they got a lot of movies there =) Appreciate it!!
@Bishop Musa No problem =)
Is this typical of S&S, and how do they compare to a new Harley assembly?
yes and that is why i rebuild a new crank. harley and jims are not much better but altima has good cranks. their rods are true.
tatro
OK, thanks for the reply, my 1946 Knuckle is a 93" sidewinder built here in Sacramento by Karl Engelenner at MMS..excellent machinist and Dyno work, crank was balanced here by Barry Gerolamy. I also bought a 93" Knuckle Crate motor directly from S&S (flathead Power)...Those 2 guys, Barry and Karl, are now retired...
built right they last. how many years has it lasted now.
tatro
I never thought about this before. But what is a practical number for bore and stroke. I bought a Shovel with Delkron cases. I was told it was a 98" when I bought it. Turns out it had an old S&S 88" Sidewinder kit in it. This was great news because I really didn't want a 98" stroker. I have new cylinders and stroker pistons. They are stock so my 88" incher will now be an 84" incher. If I over bore it .020, it will be back to 88". Anyway. in the 1980's, a 98" Shovelhead was a big deal. I rode them and felt they were a bit much. I was wondering what size would be good for overall riding on the street. I'm kind of a freeway flyer and like to ride between 40 and 80 miles per hour. Ride solo and don't pack her down.
you failed to say what your stoke is and what your new cylinders are at for the bore. for reliability and low vibration the 4-1/4" stroke form an 80" motor is the way to go. if you have 3-7/16" 74" cylinders than you get a 79ci. if you have 3-1/2" 80" cylinders you get 82ci. if you use the 3-5/8" bigbore cylinders you get 88ci. if you go to the 3-13/16" really bigbore cylinders you get 97ci.
all of these combos are using the stock 80" crank. going to bigger bores does not change the reliability or vibration much but does add alot to the power. expect a big increase in cost each time you go up in the cylinder size.
tatro
I hate to admit it, but I haven't separated the cases. Everything seems to be OK. Found my notes. My stoke is 4.625 inches. So 4 1/2" sounds right. I have no idea who made the flywheels.The pistons that came out of the engine were measured at 3.457" inches. Hmmm, no notes on the old cylinders. I know one is Harley and the other is some aftermarket. My new cylinders are 3 7/16" inch bore. I have a new set of pistons that are for stroker applications. These are for standard bore cylinders. The old S&S pistons that came out are 92-2902FP or 2900 TRW. According to Delkron , my cases are 1989 D1002 standard bore cases.
sporsterini I was always under the impression that boring for additional size was exclusive to water cooled engines like V8's. Boring for size in an air cooled engine reduces cylinder wall strength and lessens cooling capacity for the cylinders. Maybe Tatro can explain this?
Da'oud, in my time, boring was used to clean up cylinder walls to extend the life of an engine. I have never bored an engine to gain more volume for the exact reasons you stated. The Shovelhead engine I have now is the first one that I've owned that has been stroked and bored. As stated earlier, this is an early S&S Sidewinder setup. Bored .020 over with a 4 1/2" stroke. As far as automotive applications go, stroking an engine is not much more than just having the engine bored. Too bad low cost stroking and boring for American V8 engines wasn't around when I was a kid.
1st off you have a 86" motor that has been bored .020 over. this is a stroker motor, not a bigbore motor.
in harley speak for shovelhead and older bigtwin motors everything is based off of the 74ci motor. that is a 3-7/16" bore and 3-31/32" stroke. most harley cylinders can be bored .070 oversize for wear clean up. this does not count in the size of the motor call out name. your motor is still called a 86ci motor ever tho it is slightly bigger than that. on harleys you have bolt on cylinders so they can be changed for size, that is what a bigbore cylinder is. that is a cylinder that is made bigger than the stock ones are. except for the 80ci cylinder this will require case boring for the bigger cylinder spigot diameter.
a bigbore motor is one that has had the cases bored out for bigbore cylinders. a stroker motor is one that has had the crankshaft or flywheel assembly changed out for one that has more than the stock stroke.
the motor call out names are based on motor size in cubic inchs. some of these overlap depending on the bore and stroke your motor has.
when you said you had an 88ci motor that can be made in two different ways. all bore with bigbore 3-5/8" cylinders on and 80ci base motor or from all stroke on a a 74ci motor with a 4-3/4" stroke.
these two different combinations of motors are completely different in most all way on how they run, vibrate and reliability as will as in cost to do each. bigbore motors cost more to build but are more reliable and vibrate less. for harleys, stroker motors make more power and accelerate faster for less cost. the trade off is vibration and reliability issues.
for your motor which is a 86ci stroker motor, the next upgrade would be to just bolt on a set of 80ci cylinders. this would make your motor a 89ci stroker motor. the 80ci cylinders are 3-1/2" bore instead of your stock 3-7/16" bore cylinders. being only .060 bigger than your stock 74ci cylinders it is only a small increase in motor size. you could bore your cylinders oversize to get this but you would be close to the recommended max bore size for these cylinders. the thicker cylinder casting of the 80ci cylinder is a better option that can be bored another .040 if needed.
tatro