so the case as to be machined for it to fit?
Depends on length of stroke, but yes, they usually need some clearancing, to stop bits hitting each other.
it can be used with standard pistons,barrels and heads?
Again, depends on the length of stroke, but since the aim of a stroker crank is to increase the capacity beyond what can be achieved by changing barrels & pistons alone, sticking with stock B&P's would be a bit pointless
AHA!Paul Knight said:it's a shame they don't do stroker height pin (B) pistons in 85.5mm, as that'd make life a whole lot easier. I built a very similar engine for a friend a few years back, but it wasn't as simple as we'd hoped (working on past experience with 'B' pistons and low CR). We neded up with thick spacers each side, which meant the tinware didn't fit properly and needed loads of fettling to sort, and there was a lot of clearancing to do on the piston skirts etc, as they weren't designed to move so far down the bore. In hindsight, we'd have saved a whole lot of time and effort by stepping up to 90.5s. Not only will the 2165cc motor offer more power, the CR on a normal case will usually work out somewhere around ideal for your needs (assuming the case hasn't been milled on the faces), and the pistons will most likely bolt right on.
Like I say, it's not impossible to do, but I'd rather step up the power, reduce the labour and have a stock-width motor with tight fitting tin every time!
Have a look here:hermione_beetle said:i"t's a shame they don't do stroker height pin (B) pistons in 85.5mm"
can you explain a bit more please
Sounds cool!Paul Knight said:I ran a 2165cc motor in my van for years and it never let me down or over-heated. Pulled like a train, too. That had big valve heads and an fk8 cam (with 1.4 rockers) but if I drove sensibly it would still give good economy and pulled from low rpm like a stocker
Trouble is I think there's only one Bus I know of up norf with a seriously modified motor.Paul Knight said:see if you can find other folk with stroker motors and small'ish cams and ask for a ride. i did a couple 78x94s with 110 cams (for buses with cheap cranks ) and they were torque monsters. 1st gear was pointless, easier to just pull away in 2nd and a flat torque curve to 5kish. Felt like a stockish powerband just loads more powerful. I think you'd be wasting a lot of potential by using a stock cam, or even a 100. The first one had kadrons and the 2nd 34ict's. the icts may have been a bit too small (less rpm from that one and a bit 'flatter' feeling), but gave good economy and were really easy to tune.
edit:- just dug out the spec and the 2nd motor was 78x90.5 - not that it makes much difference, it could still have lived with more cam!
Well, the standard pistons would be ok but hell, this is giving me a perfect excuse to go for 90.5mmmetric_thumbs said:back in the day, old skool and all that ...... I used to trim bits off the bottom of non-VW pistons because it was not possible to get pistons with different gudgeon pin positions. You Volkswagen people have it so easy - all these bits and pieces - but it does appear to stop you think outside the box (fit any analogy you deem necessary) .
I used to trim quite a lot and even went as far as re shaping the skirt so that the crank could clear the skirt yet the thrust faces were still reasonbly long.
Anybody done this in this flat-four world?
If possible - it would let AngelV build a stroker motor with standard pistons etc.
Damn!!AngelVenomous said:Well, the standard pistons would be ok but hell, this is giving me a perfect excuse to go for 90.5mm
I'm gonna have to save up for all the bits anyway so why not?
Aw bless!metric_thumbs said:Damn!!
I was so hoping you would build a long stroke with standard pistons
I was so looking forward to reading what you got bhp/torque and mpg etc
Yes - my life is so sad someone else's figures are to stay up for