50mm taiwan bore info

evilone · Post by **evilone** » Fri May 18, 2012 11:01 am

Red Eft Performance wrote:First off Evilone how are you getting your measurement? Are you measuring the same way madman is in the pic above?

Yes. So would a set of calipers be better than feeler gauges?

evilone · Post by **evilone** » Fri May 18, 2012 11:07 am

bakaracer wrote:you want more like .20mm or.23mm range.

bakaracer, what clearance do i want at the piston skirt then? Just go half the .20mm to .23mm range (that would make it close to the .004" ?
Just want to get it correct instead of killing the bore.

bakaracer · Post by **bakaracer** » Fri May 18, 2012 11:22 am

evilone wrote:
bakaracer wrote:you want more like .20mm or.23mm range.
bakaracer, what clearance do i want at the piston skirt then? Just go half the .20mm to .23mm range (that would make it close to the .004" ?
Just want to get it correct instead of killing the bore.

the .20mm is for the top clearance. the skirt you want .05-.06mm. if you use the .04, is yours really tight or can the piston slide still?

Madman · Post by **Madman** » Fri May 18, 2012 11:25 am

Evilone, what do the port timings look like on your 50 mm bore? Cause it seems they are a little low on mine!

evilone · Post by **evilone** » Fri May 18, 2012 1:56 pm

bakaracer wrote:the .20mm is for the top clearance. the skirt you want .05-.06mm. if you use the .04, is yours really tight or can the piston slide still?

.002" / .051mm = piston slides on its own
.0025" / .063mm = piston very easy to slide but does not slide on its own
.003" / .076mm = snug (feels the best to me)
.004" / .102mm = piston snug (more than i like) and takes force to move it. Feeler gauge pulls out with a little force
.005" / .127mm =very snug
.006" / .152mm = almost impossible to insert gauge
.007" / .176mm = i'm gonna start damaging things if i keep tryin!

Need some more honing for sure!

Thanks bakaracer.

evilone · Post by **evilone** » Fri May 18, 2012 1:57 pm

Madman wrote:Evilone, what do the port timings look like on your 50 mm bore? Cause it seems they are a little low on mine!

Not ignoring you...i'll have to check later.

Madman · Post by **Madman** » Wed May 23, 2012 6:12 am

evilone wrote:
Madman wrote:Evilone, what do the port timings look like on your 50 mm bore? Cause it seems they are a little low on mine!
Not ignoring you...i'll have to check later.

Did you get a chance to check it out?

Have a new 50mm kit arriving tommorow so will have more information on another brand kit form Taida Taiwan, I'm getting ready for round 2 ding ding!

Red Eft Performance · Post by **Red Eft Performance** » Wed May 23, 2012 7:31 am

evilone wrote:
Red Eft Performance wrote:First off Evilone how are you getting your measurement? Are you measuring the same way madman is in the pic above?
Yes. So would a set of calipers be better than feeler gauges?

Best would be a micrometer and a bore gauge.

atomicareprise · Post by **atomicareprise** » Wed May 23, 2012 10:48 am

all my stroker blocks are from taiwan..

i use sheng e and sgc..fortunately the rebore work was done correctly...

seizure can be the side effect of a bad rebore works...

evilone · Post by **evilone** » Wed May 23, 2012 8:31 pm

Madman wrote:
evilone wrote:
Madman wrote:Evilone, what do the port timings look like on your 50 mm bore? Cause it seems they are a little low on mine!
Not ignoring you...i'll have to check later.

Did you get a chance to check it out?

Have a new 50mm kit arriving tommorow so will have more information on another brand kit form Taida Taiwan, I'm getting ready for round 2 ding ding!

Sorry, way too busy working on a boat. Do you want a port map or just some pics? I should be able to get to it tomorrow...i had to order parts for the boat.

Red Eft Performance · Post by **Red Eft Performance** » Wed May 23, 2012 9:46 pm

Really need deck height as well to go with these maps to figure out timing.

Madman · Post by **Madman** » Thu May 24, 2012 10:35 pm

Ok I got my new 50mm kit and had a look on the block, it appears that on the downward stroke it does not fully clear the ports by about 2mm. Is this as Baka said before that these kits Are meant for mini stroke kits which have a longer stroke downwards? What would be the effect of running like this with the ports not fully cleared?
Thanks.

LMH · Post by **LMH** » Fri May 25, 2012 12:12 am

You need to make a spacer plate or use multiple base gaskets. Check compression after of course as it may be low and may need to mill the head or bore.

bakaracer · Post by **bakaracer** » Fri May 25, 2012 12:26 am

Madman wrote:Ok I got my new 50mm kit and had a look on the block, it appears that on the downward stroke it does not fully clear the ports by about 2mm. Is this as Baka said before that these kits Are meant for mini stroke kits which have a longer stroke downwards? What would be the effect of running like this with the ports not fully cleared?
Thanks.

how much does the piston sit below the deck at tdc?

Madman · Post by **Madman** » Fri May 25, 2012 4:37 am

bakaracer wrote:
Madman wrote:Ok I got my new 50mm kit and had a look on the block, it appears that on the downward stroke it does not fully clear the ports by about 2mm. Is this as Baka said before that these kits Are meant for mini stroke kits which have a longer stroke downwards? What would be the effect of running like this with the ports not fully cleared?
Thanks.
how much does the piston sit below the deck at tdc?

It's about .5mm I guess!

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