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Re: Vlad's rides thread

Posted: Wed Jun 03, 2015 10:36 am
by Holden202T
geez I didn't think there would be a lot of wall to play with for offsetting a 202!! I guess you could always sleeve it!

interesting ... but I think that's way to much for my liking, i'll stick to where they are from factory and improve other aspects :shock:

Re: Vlad's rides thread

Posted: Wed Jun 03, 2015 1:43 pm
by vlad01
Biggvl wrote:Fitting pistons in 'backwards' was a common practice in HQ racing and speedway 202 engines, would alter the timing of the piston, leaves the piston in 'compression' stage for slightly longer - helps produce torque in the low to mid range.

As Vlad said, not good for wear or noise.

spot on :thumbup:

Re: Vlad's rides thread

Posted: Wed Jun 03, 2015 1:45 pm
by vlad01
Jayme wrote:excuse my mspaint skillz, but ive also heard of a bloke boring a 202 at an angle and then decking the block at the same angle to effectively achieve this. apparently it increased torque by a decent margin. the theory was having a more direct push on the crank allowed more power to be transferred for longer during the power stroke or something to that effect.
offset.png
yeah I heard if its the same guy, he called it a tangential engine layout and the gains were significant too.

Re: Vlad's rides thread

Posted: Wed Jun 03, 2015 2:06 pm
by Gareth
but ive also heard of a bloke boring a 202 at an angle and then decking the block at the same angle to effectively achieve this
might this have been done by moving the crank tunnel? :think:

Re: Vlad's rides thread

Posted: Wed Jun 03, 2015 2:17 pm
by vlad01
Biggvl wrote:
but ive also heard of a bloke boring a 202 at an angle and then decking the block at the same angle to effectively achieve this
might this have been done by moving the crank tunnel? :think:

Thats how I have heard it was done.

Re: Vlad's rides thread

Posted: Wed Jun 03, 2015 3:46 pm
by Chuff
Biggvl wrote:
but ive also heard of a bloke boring a 202 at an angle and then decking the block at the same angle to effectively achieve this
might this have been done by moving the crank tunnel? :think:

But then it wouldn't line up true with the gearbox, or am I missing something?

Re: Vlad's rides thread

Posted: Wed Jun 03, 2015 3:55 pm
by Holden202T
yeah theres no easy way to do it either waY :)

Re: Vlad's rides thread

Posted: Wed Jun 03, 2015 4:00 pm
by Gareth
Think outside the square...

Weld up the bell housing mounting holes and relocate.

We aren't talking about inches of relocation, more like thou's... :thumbup:

I love this topic, could talk about creative engine engineering all day, like gun-barrel drilling cranks, removing crank counter weights, etc.. :D



Sorry to thread-jack Vlad :lol:

Re: Vlad's rides thread

Posted: Wed Jun 03, 2015 4:03 pm
by Chuff
Biggvl wrote:We aren't talking about inches of relocation, more like thou's... :thumbup:
But would an offset measuring in the thou's of an inch make that much, if any, difference?

Just asking.

Re: Vlad's rides thread

Posted: Wed Jun 03, 2015 4:26 pm
by vlad01
Chuff wrote:
Biggvl wrote:We aren't talking about inches of relocation, more like thou's... :thumbup:
But would an offset measuring in the thou's of an inch make that much, if any, difference?

Just asking.

dyno sim shows a hp or 2 or 3 for 50 thou offset in the piston pin so yeah I think it would.