|
|
Post by peteyparado808 on Mar 15, 2013 3:17:55 GMT -5
do you guys think there will b any valve hitting with this set up?
an does the 52mm bbk fit in the case with an modifications, i know the 50mm bbk just slips right in..
|
|
|
|
Post by teddy554 on Mar 15, 2013 7:37:17 GMT -5
yes the 52mm goes in like the 50mm and has for the valves hitting it, no different then the 50mm need to check all clearance before start up there is a guy on another forum running the 52 scrappy kit with the big valves head and didnt have no issues with valve hitting
|
|
|
|
Post by 90GTVert on Mar 15, 2013 8:21:37 GMT -5
You can use some modeling clay on the piston to check clearance. Smear some oil on the piston crown then put a thin piece of clay where they valves should be. Smear some oil on the top of the clay too. Some clay may not need it, but without oil I had trouble with the clay sticking. Install the head and cam and turn the engine over by hand. Remove the head. First you can see if the valve went all the way through the clay. If so, you definitely need to create more clearance. If not, use a razor to cut the clay in half, going across the center of the valves. Remove one side and be careful not to squish it. You can then see how much room you have between the piston and valve when you look at the cross section.
|
|
|
|
Post by peteyparado808 on Mar 17, 2013 4:32:27 GMT -5
thanks guys... another question what do think the gains will b from 50mm to 52mm?
|
|
|
|
Post by 90GTVert on Mar 17, 2013 6:59:14 GMT -5
I don't think gains would be really big from 50-52mm. Depends how each is setup. Some have pistons that are dished, some flat, some domed. That all changed compression. If keeping the same head for the larger bore, you may get more power from increased compression.
|
|
|
|
Post by teddy554 on Mar 17, 2013 7:29:54 GMT -5
|
|
millsc
Scoot Enthusiast
Posts: 103
|
Post by millsc on Mar 17, 2013 8:52:56 GMT -5
I have the scrappy 52mm kit and run it with a 50mm big valve head, it has a domed piston though i used two base gaskets no issues. The 52mm kit is way faster than the cheap 50mm ebay kits. Scrappys kit fits right in no case modification.
|
|
|
|
Post by peteyparado808 on Mar 18, 2013 4:51:53 GMT -5
do u think a hoca piston kit can b installed in a scrappydog china made 50mm bbk?
i know hoca's piston is domed an not chinese made an scrappys is flat top an chinese.
|
|
millsc
Scoot Enthusiast
Posts: 103
|
Post by millsc on Mar 18, 2013 7:44:04 GMT -5
i know the hoca piston kit does not work on an ebay 50mm kit, my friend just tried it and it was too tight, my scrappy 52mm is domed and its a good kit im very happy with it.
|
|
