Got me bigbore kit now

BrummyMax wrote: Guilty pleasures with the curtains drawn .... Actually, Im off to see a Gamelan orchestra and have a meal. £5 all in at a Malaysian restaurant. Not sure how good it'll be. If Im really lucky, I can come home to some nice closeup pictures of engine components

as I didnt knowi googled it

A gamelan is a traditional musical ensemble from Indonesia, typically from the islands of Java and Bali, featuring a variety of instruments such as metallophones, xylophones, kendang (drums) and gongs; bamboo flutes, bowed and plucked strings. Vocalists may also be included. For most Indonesians, gamelan music is an integral part of Indonesian culture.[1]
The term refers more to the set of instruments than to the players of those instruments. A gamelan is a set of instruments as a distinct entity, built and tuned to stay together – instruments from different gamelan are generally not interchangeable.

OK, some pics......Brummy....hold onto yer pants!!

Y U M M Y

NickyBoy

You can't beat a piston with a short skirt on! Very nice!

Your rings are very similar to the Honda SP2 rings I used on my build. The head gaskets are probably the same design, but slightly bored out. Mine are Cometic too. Do yours measure 100 or 102?

My engine stand is a cheap stand with a custom adaptor for the Rotax lump. I fabbed it myself complete with pidgeon sh*t welding. It's based on KZMille's design off of AF1. I'll try and knock up some pics. You are welcome to borrow the lot though.

Blimey,so good you had to say it twice

First problem hit.  What I thought would be plug and play just isn't.  I started off with very swarfy bores, so cleaned and painted.  Next, yesterday I started matching rings to the bores...oh dear.

tapmyhed wrote: More measurements taken.. As already said, skirts on pistons bang on to the 100th of a mill. piston to cylinder clearance on each bore... 1st one i matched up gap was about .1mm, this is ok until i rotated the piston 90 degrees and it jammed.  What was my good bore is oval. 2nd one, the slack one, had 0.275mm clearance, all the way up, and it was round too. So both my bores have failed a quality inspection...one too big, one oval. If you guys ever attempt a BB as a home project, make sure you measure everything before you start.  Its not a complete disaster as I'm sure ill be able to exchange the bores. I'll keep you posted.

Both pistons are good, same in both bores.  Not saying Someone slipped up, just that something doesnt seem right and i dont want to build a grenade with me riding it....i appreciate my knowledge isnt the best but i do try to understand everything as i go along.  And I really dont mind everyone chipping in with there views, i really dont.  And im not about to berate anyone either, ive been in engineering all my life and ive learnt that sh*t does happen even against best intentions....its how you deal with it and get it sorted no blame at all!  im really hoping ive made some school boy errors, because i want to learn.

Ohh this is getting interesting.

fusebox wrote: yes mate it does! depending on which engine you have and which aftermarket pistons youve got to which way round you fit the new pistons! im sure this isnt causing this issue in particular but it will cause issues if they are fitted the wrong way round! just wanted to help...

Jeez!! Piston offsets...whatever next???
When i started this i thought i could just.lob them shiney bits together, a couple if white knukkles tightening the head then brummy mentioned ring gaps, then i bought a thick book, then i noticed the bore thing, which might be sommit or nuttin....my head hurts, especailly having to hop from inches to mills all the time!!

Ive been on some steep learners before and this is up there with the best!!

Hats off to guys that do this for a living, thats for sure.

Hats off to everyone trying to help me out too, phone calls to follow, sitting in car with littkeun who is asleep, wife doing the ashes thing...

Is there no arrow or F on the piston crown then if they are offset?

Tap!

BrewBitch wrote: Tap!   look forward to it mate, you shall go to the ball!     426Hemi   impressive! your the man!!!

come on lads it had been a long day!


tapmyhead

chat soon...we'll run through a few things that you may not have picked up on, to make sure that your build goes a little easier. knowledge is power! heheh!

426 hemi

warren = clever bastard!




ill get back in my box now.....