big bore and reliabilty 1060vs1102

geobarb wrote: what about the subject of losing power quicker?Is it true?

Don't go on AFI so haven't a clue what the Yanks take is on this, but my 1060 was dyno'd at 139.4 rwbhp when fitted, 141.5 two years and 2500 miles later, so by that result they get stronger with more miles ;)

There is no way to know 100% that you will build a big bore kit...no matter which option...and never have to bother again with the engine

geobarb wrote: Hi shyted,i dont think that there is major difference in cost between 1060 and 1102. That is because you need to replate the cylinder with nicasil,and if you add that cost,you will be very close to 1102. You said that you never saw an 1060 faill,did you saw an 1102 fail? The crank case pressure is a logical argument.

Geobarb,no i don't know anyone who's 1102 has failed. I only know hemi who has anything bigger than 1060.
I know that the 1060 had failures early on ,but having read the posts on AF1 it's nearly always been down to incorrect build.
failure on anything bigger has been down to mechanical chaos,usually down to the weight of the piston and viberation associated with it.Not necessarily on road bikes either.Then again is that down to build too and the way people push things? I don't know
Go and look for yourself on AF1,it's well documented.
The steel liner seems to be more reliable and if i remember it may have been Amurai who tried that.
If you want to do 1102 do it.It's your bike and cash.
You asked what we would do ,and thought, and i told you what i ( me ) would do . Certainly don't think i'm telling you what to do .
By the way,Langcourt international charge £110 + VAT(TVA) and postage per barrel for plating and i know that as i've just had one done.
How much is it all ? Have you priced it ?
Or better still if your really concerned about reliability,buy some carbon wheels instead.Less hassle and a thousand times more reliable and that i have first hand experience with.

Hemi,got something to tell you dude.Will PM you.

Shyted wrote: Hemi,got something to tell you dude.Will PM you.

oooh secrets I like those...isit a link to cheap bst's

In Greece noone can do it

Once you start talking iron liners my brain wonders how many mm you could hog it out to by machining the cases

A 1060 is basically just a couple of service re bores in old money, an 1102 with liners is a B/bore and starting to push the boundary's of the rest of the engine

redratbike wrote: So whats a spoon valley racing 1127?

Fitz wrote: redratbike wrote: So whats a spoon valley racing 1127? Insane !!!!!! They also make a supercharger kit for the gen 2 rsvr

basically it's for any rotax v twin so gen1 as well.

Spoonvalley don't make a plenum for gen1, surprising how little you get in the kit and have to do a lot of engineering yourself, still trick as f**k though.

The spoonvalley way certainly isn't cheap, trick as but not cheap. I would love a supercharged bike but on a twin it gets expensive and I have my old gpz1000rx that I want to do like the h2.

Tifa wrote: Going 1060 is a great comprimise, reliability vs performance. Up to now, nobody (i don't think) has mentioned the extra load on the ends and mains. They have a definite stress threshold before they'll let go I recon.

Personaly agree with what your saying there Tifa.As not to sound like" i'm holyer than thow",i wouldn't even do a 1060 withought renewing/overhauling the oil pump.I would also be looking at the stator windings to see if they'd gone black,if they had then they'd be out too.
That's just me though.
I have been in touch with Micah from AF1.As a result of that exchange,i'm doing the mains and big ends to the largest shell tollerance so when i build this motor i have on the bench it will be bang on and with a 1060.Will be having the crank to Wrathall too for the oilways chamfered

Shyted wrote: .Will be having the crank to Wrathall too for the oilways chamfered

isn't that an easy thing to do?  ( ha ha ha  it is when you say it fast he says)

Can tell you one and that's
Langcourts Engineering LTD,
Unit G,
The Link Centre,Weston-Super-Mare,
North Somerset
BS24 9AY
U.K
Tel +44 1934 612226
UKOffice@langcourt.com
Used them several times with all manner of problems and they are very consistant.