AlisoBob's Gen 4 A/F Conversion

[britincali]

1. If the piston was measured prior to boreing how was the coating not accounted for?

2. Isnt it bad to put holes in an already fragile cast piston?

[Roostius_Maximus]

1. If the piston was measured prior to boreing how was the coating not accounted for?

Irrelivant
All pistons are made to fit in bores that are finished 89,89.25,89.50........91.00

custom clearences and the obvious check of the piston to make sure its not packaged wrong provide a spec on the pistons size.
Vertex lists the piston dimension in the book, and the bore size its to fit, then figuring that mainly men will be dooing the work and not read the book its also marked ontop of the piston, 90.00 (inteded bore) and 89.94(piston size) so its giving itself a clearence of .0024"
vertex is thee only brand of piston that i'll bore a cylinder for and send it accross the country with out ever having the piston on hand, and figuring that the customers piston hasnt been damaged from his supplier to him, its correct.

in other words, if the bore is to be the next vertex size larger than 89.50mm, it should be 90mm, not 89.99mm or 90.01

[britincali]

Learn something new everyday....

[lewisclan]

Learn something new everyday....

so have I Thanks

[britincali]

Those transfers look completly stock (can still see the casting roughness on the sleeve and jug) I dont think anything has been ported there





Is that the way they are from factory?

[2strokeforever]

Those transfers look completly stock

just had my jug off and mine is way rougher
so they had something done to them

[glen howell]

123.

[100hp honda]

i rekon the piston should drop right in with few hammer whacks . nice variable transfers btw

[2strokeforever]

Those transfers look completly stock

it looks like the someone forgot or didnt have time to smooth out the rear right port (for free) which explains the 1/2 mm difference, or it could be suposed to be that way, if you look at eric gorrs book it says cr80s came like that and those motors still are better everywhere than most powervalved 80s, so it could be glens secret

as for the moly if glen says its good then slap it together and then decide if you are unhappy... expecting ride report tomorow
im sure if it seizes because of a weird shaped cyl he will fix it for free

[glen howell]

123

[100hp honda]

Issue #4 is head. Its beautiful....

but Glen marked it as having 0.124" milled off, and the quench recut. Will it run on pump gas? I sure hope so. Glen said its right on the fine line of needing race gas. That not what I wanted at all.

didnt notice at first glance the lip step thingy. guess its the quench ?

[100hp honda]

Those transfers look completly stock

it looks like the someone forgot or didnt have time to smooth out the rear right port (for free) which explains the 1/2 mm difference, or it could be suposed to be that way, if you look at eric gorrs book it says cr80s came like that and those motors still are better everywhere than most powervalved 80s, so it could be glens secret

huh ? i never read the book but seen various quotes that people have posted. wheres this book ? most likely you interpreted wrong what it said. transfer ports can open/close at different times on the same side... as youve seen from the cpi graph i posted..... but the opposing port on the opposite side will mimic it. make sense ?

[100hp honda]

Those transfers look completly stock

just had my jug off and mine is way rougher
so they had something done to them

wrong. brit is right. not often hes right this time he is

[100hp honda]

1. If the piston was measured prior to boreing how was the coating not accounted for?

Irrelivant
All pistons are made to fit in bores that are finished 89,89.25,89.50........91.00

custom clearences and the obvious check of the piston to make sure its not packaged wrong provide a spec on the pistons size.
Vertex lists the piston dimension in the book, and the bore size its to fit, then figuring that mainly men will be dooing the work and not read the book its also marked ontop of the piston, 90.00 (inteded bore) and 89.94(piston size) so its giving itself a clearence of .0024"
vertex is thee only brand of piston that i'll bore a cylinder for and send it accross the country with out ever having the piston on hand, and figuring that the customers piston hasnt been damaged from his supplier to him, its correct.

in other words, if the bore is to be the next vertex size larger than 89.50mm, it should be 90mm, not 89.99mm or 90.01

piston should slide through the bore. with or without the fukkin coating. what good is a coating if the mother fuker wears off first 20 seconds you fire it up because the son of a bitch was bored wrong . for hells sakes dude, your supposed to be the canadian engine master, would you put a piston in if the damn thing wouldnt slide down ?

[100hp honda]

sorry for getting pizzed but this is irritating. most of you guys are probly real smart but say stupid shit sometimes. think about this stuff, alot of it is 3rd grade common sense. dont need a damn college degree

1- piston supposed to slide all the way through the hole, coating or no coating... period. if not then the machinist is a jackass.

2- opposing ports should mimic each other.... period

3- dont have a fuggin clue why that step ledge thing is in bobs head. shouldnt be like that though.

[AlisoBob]

Here are the tops of the transfers. The right side isnt visable, the main intake in the center is, and the left side transfers are clearly open.

WTF does a base gasket, rings, or rod have to do with in Glen?

The piston is tightly stuck in the bore, no way any piston rocking is going to occur.

Look back at the other photos, you can see where the piston is cam ground, and the coating is already off exposing bare aluminum.

I'm taking you up on your deal Glen, send me a new cylinder , piston, and head and I'll return everything to you. You have my address.

You call me a whiner, because you did all this work for me for free? That somehow gives you the go-ahead to do half assed work and removes my ability to comment honestly about it? Beleive me Glen, had I paid for this, I would have had even bigger issues with this.

Glen, you begged me for a long time to do this, I never asked... thats the truth.

[AlisoBob]

I think if I was him and that unhappy with the work I would send it back and accept my offer to replace with new parts ,a new head,a new cylinder,a new piston. Which would be a good deal for him since his cylinder is a 60 thousands over and he would be getting a new std cyl and head

Send it, I already boxed the stuff up to send back to you.

[100hp honda]

holy shit stains batman . them transfers are really fukked.

[AlisoBob]

By the way Glen.... the cylinder is 1mm over ( 90 mm)

1 mm over is 0.40", not 0.60" over...... but whos counting.

Am I being too picky on the fact too?

[britincali]

[100hp honda]

any chance of a quick ride report before sending it back ?

[britincali]

[100hp honda]

funny thing i typed train wreck and same photo pops right up

[AlisoBob]

any chance of a quick ride report before sending it back ?

I want nothing to do with it..... Glen can have it back.

[100hp honda]

just real fast. around the neighbor hood ?