Big Bore, the return.

Right then, another productive hour. 3 out of 4 cams set up...just the inlet on the front to do. The rear exhaust took some grinding to get in..just got to go steady with the dremmel. The other two were simply using the play already built in.
Could be good for a strip tomorrow, can't wait.

Did better than I thought today, last bit of dremmelling hit the mark first time, all cams now in. I even split the engine apart again to look at the piston clearances.

A quick look shows all good, 2 inlet valves on the front look pretty close but no piston contact whatever. I'll put it down to a smidge of piston rock and gravity as the front is leant right over compared to the rear and I did the build without rings fitted. Squish clearances look bang on.

Anyways, they are back in a box and I'll look at them proper and compare them to stock. If totally happy, they go off to camcoat with the exhausts for the full treatment Monday or Tuesday....2-3 week turn around.

I'll get some pics up later of the pistons.

Right then....fukkyfukkyfukky.

Pistons need recalibrating.

Measured proper, insets are in 0.4mm too much and crown also needs 0.2mm off as well.

Not pleased.....but f**k it, I'll crack on.

At least my cams are ding dong spot on. I better crack 150 bhp after all this arse ache.....

Not sure I'm liking the semis.......but I'm trying!

tapmyhed wrote: Not trying to like semis.......trying to get this finished....

LOL, sorry , us blokes don't need distractions, good work so far, it's been fascinating what you've done, you've taught me a great deal.

Not to mention all the special tools and brackets I've had to buy or make. Don't under estimate the time needed to do a good job if you have never done it before.

I stripped the engine down this afternoon....wait for it....10 mins flat, both heads and pistons off from fully torqued and can tested. Once you know......

No not really.

Can't find the post

Pm Micah on af1 he will answer

Amaurai mentioned 1mm radial clearance on the cutouts

So many posts on af1 I have read the info somewhere spent an hour at work looking for the post Micah wrote.

Cheers fellas, sometimes lose the will to live on this project.
But....the engineer in me wants to know more and do more. I wish it was just building the engine, but no, once that is done I got to take the old one out, put this one in....then get my front forks sorted, change front disks, get it started, dynod.....and to really finish it off, a respray....
Anyways....thanks for the support and I really mean it, top forum top people.....
Anyway, back on your heads. I'm seeing a machinist in the morning to get the pistons sorted....I'm not stopping! Had them in the dishwasher tonight to give them a bloody good clean too.

:-)

tapmyhed wrote: How does this sound??? The machining of the insets may cost up to 400!!! Due to set up per piston per inset. What was suggested was to trim the valves back a bit. I'm not sure as I have a feeling the valve also serve to protect the seats.... What's the opinion on here?

you need to find a nice friendly engineering shop or a toolmaker who would do it for beer money on a Saturday morning

Ha ha good call on the stock pistons

Well I have some good news in part , my engine , cams and bores out cylinders / pistons should be with me late tomorrow night , bad news is it cost more than I was quoted and I need to source head gaskets , I'm thinking with the cp pistons there should be no need to machine them but I'll check anyway , I'll also make a arbour up to machine the slots in the cam wheels .
Tap , good to hear your making headway even if it's in slowtime , better to take your time than rush and be sorry .
Chris

No , I will do that as and when I have time .

tapmyhed wrote: get the old engine out too .

Thank God you've it !

Do I've guts for a like 'survey' ?

I'm still deraming of Rotax 1190 ( 1127-kit with 4 mm. stroke).

At least I've three engines !