jvb5577 Posted April 19, 2013 Author Report Share Posted April 19, 2013 ^ What is that bored too? Quote Link to comment
EricJB Posted April 19, 2013 Report Share Posted April 19, 2013 ^ What is that bored too? 89mm. KA pistons. Z22 crank. 1 Quote Link to comment
Stoffregen Motorsports Posted April 19, 2013 Report Share Posted April 19, 2013 Rebello bores Z-22 blocks on a regular basis. I worked for him for almost 10 years so I know this. Rebello has a secret to boring the Z22. Quote Link to comment
EricJB Posted April 19, 2013 Report Share Posted April 19, 2013 I worked for him for almost 10 years so I know this. Rebello has a secret to boring the Z22. Do tell. I promise I wont tell anyone. Quote Link to comment
Sealik Posted April 19, 2013 Report Share Posted April 19, 2013 Here is the Z22 bored to 89mm...with 7 extra holes drilled into block for cooling Modified Z24 Felpro HG with 9 extra holes Quote Link to comment
EricJB Posted April 19, 2013 Report Share Posted April 19, 2013 The problem I ran into with boring a block that starts at 85mm, is if you have to pay someone to do it, they will charge you more to make the extra passes. So it becomes more $$ for a weaker block. Quote Link to comment
Stoffregen Motorsports Posted April 19, 2013 Report Share Posted April 19, 2013 The problem I ran into with boring a block that starts at 85mm, is if you have to pay someone to do it, they will charge you more to make the extra passes. So it becomes more $$ for a weaker block. Nobody ever said horsepower was cheap! Quote Link to comment
EricJB Posted April 19, 2013 Report Share Posted April 19, 2013 Here is the Z22 bored to 89mm...with 7 extra holes drilled into block for cooling Modified Z24 Felpro HG with 9 extra holes Everytime you guys talk about drilling the head gasket, it reminds me of when I was in tech school and needed to drill a hole in one. Being an idiot I just walked over to the drill press and started drilling. Within 2 minutes I was calling the parts house for another one, with the first one wrapped around the spindle. Thanks for making me relive that painfull memory once again haha. Quote Link to comment
EricJB Posted April 19, 2013 Report Share Posted April 19, 2013 Nobody ever said horsepower was cheap! Aint that a fact! I took mine home and did it on my Bridgeport. Took hours and hours, at one point I fell asleep. I left .010 for someone else to hone it. Quote Link to comment
Sealik Posted April 19, 2013 Report Share Posted April 19, 2013 Everytime you guys talk about drilling the head gasket, it reminds me of when I was in tech school and needed to drill a hole in one. Being an idiot I just walked over to the drill press and started drilling. Within 2 minutes I was calling the parts house for another one, with the first one wrapped around the spindle. Thanks for making me relive that painfull memory once again haha. Ha ha...yeah I fucked up my first one....lol The trick is to tightly sandwich the HG between some wood.... Made a jig... Used a laminate trimmer for the larger passage....lol Quote Link to comment
datzenmike Posted April 19, 2013 Report Share Posted April 19, 2013 Also, what year R1 carbs will work or will all of them? http://community.ratsun.net/topic/7862-r1-carbs-lots-of-pics/ Quote Link to comment
Z-train Posted April 19, 2013 Report Share Posted April 19, 2013 :o That is pretty sketchy. Although if it has been done a lot just got to make sure you have a good machinist. Does anyone have a picture of a bored Z20? Nothing "sketchy" about it.And good or bad doesn't matter.He wasn't familiar with building Datsun strokers.ANd why should he be?These motors were out before he was alive. Quote Link to comment
Z-train Posted April 19, 2013 Report Share Posted April 19, 2013 I worked for him for almost 10 years so I know this. Rebello has a secret to boring the Z22.Really?My local guy did my boring. Quote Link to comment
Stoffregen Motorsports Posted April 19, 2013 Report Share Posted April 19, 2013 Aint that a fact! I took mine home and did it on my Bridgeport. Took hours and hours, at one point I fell asleep. I left .010 for someone else to hone it. You ought to be awarded for bravery! I would not try to throw a block in my mill, but then my mill is a worn out pile... Quote Link to comment
Stoffregen Motorsports Posted April 19, 2013 Report Share Posted April 19, 2013 Really?My local guy did my boring. You can get lucky. The Z22 blocks can be a problem with the steam holes. There's no science here. No two castings are going to be the same. Quote Link to comment
jvb5577 Posted April 19, 2013 Author Report Share Posted April 19, 2013 http://community.ratsun.net/topic/7862-r1-carbs-lots-of-pics/ So for the R1 carbs it should be 98-01? Quote Link to comment
EricJB Posted April 19, 2013 Report Share Posted April 19, 2013 You ought to be awarded for bravery! I would not try to throw a block in my mill, but then my mill is a worn out pile... It was a major PITA. My boring head was too big to fit in the hole at first, so I had to do top half/ bottom half. And the bore is deeper than the total Z axis travel, so I had to raise the table the last inch or so. Many rough passes, and then one full length final. Quote Link to comment
jvb5577 Posted April 20, 2013 Author Report Share Posted April 20, 2013 I just want to make sure that this is TDC. Quote Link to comment
Xnke Posted April 20, 2013 Report Share Posted April 20, 2013 It's pretty easy to get an L20B block to 89mm...Just spendy. Just like the method I will be using to take my LD28 block to 89mm... Call LA sleeve or Darton. Quote Link to comment
jvb5577 Posted April 20, 2013 Author Report Share Posted April 20, 2013 Also this is the cam that is in it right now. Has what looks to be a U20, so this is still stock correct? Quote Link to comment
EricJB Posted April 20, 2013 Report Share Posted April 20, 2013 Yes that is a stock L20 cam. Quote Link to comment
datzenmike Posted April 20, 2013 Report Share Posted April 20, 2013 I just want to make sure that this is TDC. TDC is set by aligning the notch on the crank pulley to the ZERO mark on the timing scale. This thing... ...to this thing... Then look through the top hole in the cam sprocket and you want to see this... Notch just below and slightly to the right of the horizontal line on the cam thrust plate. Quote Link to comment
jvb5577 Posted April 20, 2013 Author Report Share Posted April 20, 2013 Alright so I was a little off. This USA made shit sucks! No notchs at all and you have to look threw the sprocket to see if its lined up. Horrible design! :mad: Quote Link to comment
datzenmike Posted April 20, 2013 Report Share Posted April 20, 2013 You also need to bring the crank up to and stop at TDC in a clockwise direction only. No backing up. If you over shoot, back up a couple of inches and try again as many times as needed to get right. If you back up, the chain slack will transfer to the 'tension' side and give an inaccurate reading. Quote Link to comment
Sealik Posted April 20, 2013 Report Share Posted April 20, 2013 Alright so I was a little off. This USA made shit sucks! No notchs at all and you have to look threw the sprocket to see if its lined up. Horrible design! :mad: Yes the 3 hole's suck.....more so if manufactured in USA...lol Beck Arnley had some good sprockets made in Japan.....find the old stock if you can. The new stock (on right) is 4 hole....but... as you can see... Holes are offset ....notches for timing the head are now MIA This one came with no marks...calculated and cut my own Quote Link to comment
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