Getting my Piston Ring Gapped and Crank Micropolished - Honda Prelude Forum

97BB6sh · 06-29-2004, 09:18 PM

OK... im going over to machine shop and getting my piston ring gapped and crank micropolished.
They quoted me $350 is that resonable?
they do build honda race car, they have 8 sec and 9 sec civics...
so i can trust them w/ the work they do.

what do you guys think?

97BB6sh · 06-29-2004, 09:21 PM

oops!! i forgot to include what i have...
i have
1. Golden Eagle HD sleeved block
2. 9:1 CP Pistons
3. Eagle Rods

[SUB[EX] · 07-01-2004, 07:58 AM

is that including new rings and new bearings?
Basically a rebuild?

tenzola · 07-01-2004, 04:41 PM

for that price i think they re-using the bearings

i know my main bearings, rod bearings, thrust bearing and rings alone cost me around $250

not to mention the time involved

then again.. maybe this build isn't built yet.. am i correct to say the engine isn't put together yet.. so this is just kinda "extra" stuff while the engine apart

also... when you say the rings are being gapped.. what do you mean by that.. i know you're supposed to check ring end gap but that's when you installing the pistons into the block also with the micro polish.. not to say that it may be useful in your setup.. but i polished my crank journals with croaker cloth i believe it's called and that gave it a very nice finish

[SUB[EX] · 07-01-2004, 10:14 PM

Im just thinking, if they bother to tear it down im sure they wont reuse old bearings. Thats not too good of an idea. Im sure its new rings. Would you actually GAP with old rings?

I got my whole crank kit with new bearings and a new crank for about 250$ plus core charge.

Also im sure the engine is not assembled and not in the car.

I heard 200$ if you can find the right shop. Thats for bearings and rings and full assembly. Thats not Micropolished or anything tho.

97BB6sh · 07-01-2004, 10:58 PM

no... it's not rebuild
im assembling it myself
they are just setting the end gap for the piston rings, and micropolish the crank.

I went to the shop wednesday with all my stuff and they gave me exact price, it came out to be 295.
150 for setting end gaps for pistons
145 for micropolish the pistons

btw... i bought the whole bearing kit for $100. It includes all the main bearings, connecting rod bearings, and thrust washer.

97BB6sh · 07-01-2004, 11:06 PM

Quote:

also... when you say the rings are being gapped.. what do you mean by that.. i know you're supposed to check ring end gap but that's when you installing the pistons into the block also with the micro polish.. not to say that it may be useful in your setup.. but i polished my crank journals with croaker cloth i believe it's called and that gave it a very nice finish

yes, i do mean "end gap" sorry i wasnt specific enough..

there is specific end gap you have to set for every use....
im building my block for turbo, im not sure of the exact spec but i know it's usually more end gap then naturally asperated....

tenzola · 07-02-2004, 07:15 AM

fudge.. i got ripped off... no wonder my build cost so much.. and that was just getting everything back to stock.. oh wait... i think all the bearings did come out to around 100... it was the rings that added to the price and don't forget the ever so loving taxes

[SUB[EX] · 07-02-2004, 08:40 AM

Im a little confused on what Gapping the rings is.

Would that be choosing the correct rings for the job or are they actually able to adjust the rings?

tenzola · 07-02-2004, 04:10 PM

that's a great question that i would also like to know.. i always thought that you buy oversized, undersized, or standard.. and the check is to just make sure that everything is going to fit right and not allow too much blow by

Ludeykrus · 07-02-2004, 06:00 PM

As you should know, a piston ring has a slit, an open end for where you slip it over the piston. This gap is also there because the ring's metal will expand, and the gap allows the ring to expand around the piston instead of out towards the cylinder walls. You want the gap big enough so that when the motor gets hot, the gap will not completely close up. If the gap closes up, the ring will then expand outwards, effectively making the ring bigger and it will scour the cyilnder walls or sieze the pistons.

In a turbo car, the motor gets much hotter and the combustion chambers move more heat due to the boost; therefore you must run the gap bigger so the ring never "closes".