Do you have a kit that is missing some literature? The number you are referring to is for kit with pistons and cylinders already set up. It has a paragraph that says if you want to confirm clearances, use the specification sheet. The only spec sheet I could find was older and didn't have this new kit included. According to their current catalog, the pistons are forged so that's how you should set them up.

I did find a note for the 4" bore V100" piston kit, for Super Sidewinder engines and custom 4" bore engines. Kit 92-1402.

Recommended Piston Fitment: Close: 0.0020"-0.0025" Loose: 0.0037"-0.0045"

Also, be sure to follow their instructions for measuring the clearance.

This looks to be their recommendation for setting up their forged pistons. Most of the specs in their older spec sheet has these numbers. To be absolutely certain, you should call or email S&S directly for the straight scoop.

Or, if you wait around here long enough, there might be someone that is an S&S dealer come up and clear it all up for you. Good Luck.

What is your little flag under your screen name? Is that Russian?

 

Those are specs for S&S forged pistons,,,
Basically,, if you ride easy,, and don't place a heavy load on the engine,, and do not mind a 1500-2000 mile break in,,use the smaller of the specs,,, if however you want to start running it hard after the 500 mile oil change,, use the greater clearance..

 

[ЦИТАТА="rootintootin, сообщение: 5954393, член: 102251"]
У вас есть набор, в котором не хватает литературы? Номер, на который вы ссылаетесь, относится к комплекту с уже установленными поршнями и цилиндрами. В нем есть абзац, в котором говорится, что если вы хотите подтвердить зазоры, используйте лист спецификаций. Единственная спецификация, которую я смог найти, была старше, и в нее не входил этот новый комплект. Согласно их нынешнему каталогу, поршни кованые, так что вы должны их настроить.

Я нашел заметку о комплекте поршней V100 с диаметром цилиндра 4 дюйма для двигателей Super Sidewinder и нестандартных двигателей с диаметром цилиндра 4 дюйма. Комплект 92-1402.

Рекомендуемая посадка поршня: Закрытая: 0,0020–0,0025 дюйма Свободная: 0,0037–0,0045 дюйма

Кроме того, обязательно следуйте их инструкциям по измерению зазора.

Похоже, это их рекомендация по настройке кованых поршней. Большинство спецификаций в их старых спецификациях имеют эти цифры. Чтобы быть абсолютно уверенным, вам следует позвонить или написать по электронной почте напрямую в S&S, чтобы узнать все подробности.

Или, если вы подождете здесь достаточно долго, может подойти кто-то из дилеров S&S и все прояснить для вас. Удачи.

Какой у тебя маленький флажок под псевдонимом? Это русский?
[/ЦИТИРОВАТЬ]
да. Русский. из Москвы.
к сожалению в коробке с набором была только бумажная реклама и описание. никаких технических характеристик не было включено. поэтому возник вопрос. есть подозрение что зазор меньше чем надо. в ближайшее время сделаю прибор, чтобы правильно измерить и проверить свои опасения.
спасибо за информацию и поддержку.

 

OK, I guess this means that flag is Russian.

If that is you quoting me, Maybe I do speak russian after all.

ладно

Did you forget to hit the translator button?

Yes. Russian. from Moscow.

unfortunately in the box with the set there was only a paper advertisement and description. no specifications were included. so the question arose. there is a suspicion that the gap is less than necessary. in the near future I will make a device to correctly measure and check my fears.

thanks for the info and support.

 

OK again. If there were no instructions you can go to the S&S web site and download a copy. It will have some important things you will need to know.

Look at these.

510-0578-100_110-kits.pdf (roccommerce.net)

 

checked the thermal gap. nothing good. the cylinder liner is uneven. the gap dances from 0.04 to 0.065 mm. In principle, this fits into the parameters of the instruction. but the fact that the sleeve is not even, I really do not like.
sorry for the cyrillic. the translator did not work correctly. I understand that the Cyrillic alphabet is understandable and interesting to few people.

 

Did you put the jug in torque plates while you were checking the gaps? The plates will make a difference.

 

and another question. I put in a high capacity oil pump. with the prospect of installing an oil cooler. do you do anything with the pressure reducing valve?

 

Is the big bore kit new, or has it already been installed on a motorcycle? Did you get it and you are trying to install it on your bike? Is it complete with cylinders, pistons, rings, and assorted gaskets and o rings?

 

Your findings are not uncommon. Proper fit in plates for the 4" bore cylinders should be plus or minus .005mm top to bottom. Return them if they are not straight and true. The proper clearance is built into the piston, CP brand, which have great QC.

 

it was a brand new complete set. with pistons and gaskets. was installed on a 2000 electric glide 1500 kilometers ago. but no measurements were made before installation. After that, the throttle carburetor was set up flat and the ignition was replaced. S&S 509 camshafts were also installed. My friend's motorcycle came to me in this condition. I removed the cylinder heads from it. in order to put them in order. clean from soot, grind the valves and replace the oil seals. as a result of which I saw traces of sticking of the piston to the cylinder. I did not like the picture and I decided to study this problem in more detail. engine oil used Motul 7100 20W50.
Basically, I don't see anything wrong. but in the future I want to put thicker shells. because on those that I have the lower part is quite thin. 1mm, which cannot give the necessary rigidity. to do this, you will have to increase the diameter in the crankcase. Well, buy new pistons.

 

Now if you have accurate gauging, torque plates, and a proper fixed power honing machine you will see it takes a .05mm or so to straighten out the cylinder. Now you have too much clearance. These cylinders are too thin at the spigot to do any more than a clean up on, no overboring. Now the pistons, yours, can be coated with buildup coating such as swain coatings PC9 and you run file fit .005" OS rings. Not fun but does fix the issue.

 

interesting idea. but I'm afraid that this technology with a piston coating is not available with us. there are no problems with metalworking, but here is the coating. I'm afraid that it will be easier to make and change sleeves in our conditions. not cheaper, but easier. I will study this issue. thanks for this advice.

 

Those are steel sleeves, a special alloy, to allow the very thin spigots. Best of luck, cast iron is out, some of the higher strength ductile irons may work. A low tech logical solution is to just bore and hone stock cylinders and settle on the common 95". Very compatable with a flat top piston and those mild 509 cams.

 

we sell blanks for such sleeves. made in usa. but the design offered by S&S is too thin. this is not credible. I think the problem is not in quality from S&S, but in the fact that everything is very thin.

 

The honing job from the inception is the root cause. I measure and reject many.