Piston and Cyl pics...

[maddog1927]

helping a friend with his 500. Top end has about 2 hrs on it. Reason for tear down is a shifting issue, but noted some marks on the piston and cylinder. Ring end gap is .016".

Any ideas on what caused this and how to correct. Some of the scratches in the piston are .005" or so. with eyes closed marks in cyl cannot be felt.

[Gmbond]

Intake side only??

Dirt ingestion past air filter or airboot seal??

[AlisoBob]

Throttle was hammered on without the engine being brought up to temp.

Who gasported the piston?

[maddog1927]

Who gasported the piston?

Jay Boren, a friend of mine in the phoenix east valley that does mostly banshee stuff.

[100hp honda]

mine did same thing but got exh side also. main 1 step small was my final conclusion. not sure what happened on yours. chamfers look fine so i dont know

[100hp honda]

dont try and be a hero at the dunes . still aint got around to taking it fully apart yet. popped the head just to see what damage was done

[britincali]

Whats all the red shit?

[100hp honda]

just grease. put it around the top and bolt the head on then put oil in the plug hole to get your compression ratio

[AlisoBob]

I put oil in the plug hole to get your compression ratio

They just got this new fangled shit called MATH all figgered out.

You should check out that shit.....

[100hp honda]

its always easy for people that never done it . ALOT faster to pour oil.... about 2 hours faster but thanks for your concearn on my math skills

[100hp honda]

no point in making a 10min deal a 7hr head scratcher. alot of bullshit to figure it on paper. im not even sure how to do it. wouldnt you still have to pour something in the dome then subtract the amount the piston protrudes into it then figure was volume in in the headgasket bore and blah blah blah. ill stick with oil in the plug hole

[AlisoBob]

....but thanks for your concearn on my math skills

[youtube]http://www.youtube.com/watch?v=Pj3SIXtL ... e=youtu.be[/youtube]

[100hp honda]

from start to finish i doubt the oil thing takes 10min. piston at tdc, smear grease, bolt on head, measure amount of oil poured in hole. divide that by your total cc. shazam dont get no easier than that . watch and learn grasshopper

[AlisoBob]

I told you to buy the bore gauge.... so you have that right?

So measure the bore.

With that measurement, the distance from the roof of the exhaust port to the deck, the head gasket thickness, and the head volume you can compute the true compression ratio.

THEN, if you change ( or just want to run the numbers) on a new setup like a different head or exhaust port timing... you just punch the numbers into your calculations...

Its 2011 Clyde.

[AlisoBob]

watch and learn grasshopper

The REAL FUCKING compression ratio starts when the exhaust port closes ..... grasshopper.

500cc of displacement, crammed into a 50cc chamber ISNT a 10:1 motor.


Ahhhhhhhhh.................. no.

If you think that, it explains ALLOT as to why your shit doesnt run...

[2strokeforever]

With that measurement, the distance from the roof of the exhaust port to the deck, the head gasket thickness, and the head volume you can compute the true compression ratio.

and the dome shape on the top of the piston dosent matter?

500cc of displacement, crammed into a 50cc chamber ISNT a 10:1 motor.

that could depend on the pipe and rpm if you want to get technical, to figure out what exactly is going on in there is gonna be tough

[AlisoBob]

...and the dome shape on the top of the piston dosent matter?

No..... its a constant.

The displacement of the dome when the exhaust port closes is the same displacement at TDC

[2strokeforever]

good point, i never even thought about that

Reason for tear down is a shifting issue

if it was put together and it didnt shift i would wonder if whoever put it together knew what they were doing
maybe he assembled it dry, without oil and the first time it ran it scored a little?
maybe crooked bore and/or tight piston

[100hp honda]

if you want to spend your life doing shit the hard way then go ahead.

[100hp honda]

[AlisoBob]

if you want to spend your life doing shit the hard way then go ahead.

You and your buddy GSSlen are closer than you will ever admit.

Math is easier than smearing grease on everything .... but your too stupid to see that.

Thread hijack over.....

[100hp honda]

by your method how do you propose to figure the head volume ? on paper ?????? at this point your kinda looking really dumb

[britincali]

I just bolt my shit together and kick it.....

[Roostius_Maximus]

[AlisoBob]

at this point your kinda looking really dumb

Can you even read?

...With that measurement, the distance from the roof of the exhaust port to the deck, the head gasket thickness, and the head volume you can compute the true compression ratio.

I'm starting to think Gsslen IS your Dad... Why dont you go on Springer, and have a "Baby-Daddy" test done?