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| 225 deck height https://slantsix.org/forum/viewtopic.php?t=61043 |
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| Author: | nzpete [ Thu Apr 20, 2017 1:26 am ] |
| Post subject: | 225 deck height |
Sorry this topic probably has been done to death, but I can't think of the right words to enter into search function. I current have a block,getting bored, and it will be fitted with crankshaft, pistons and rods from another engine. The block appears, when comparing it to a virgin block to have already been shaved 60 thou. I've heard from lots of people that the pistons have a reputation of been down the bore a long way at tdc. I know the right way would be to assembly it, measure and then surface grind, but what I'm after is whether I would be safe to ask to have it surface ground another 20 thou, so it would now be 80 thou off. It's a five welsh plug motor, around 1970 vintage, would guess. Please let me know if you think I would be taking a risk to go to 80 thou without measurement.( I have heads that have never been shaved ) |
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| Author: | Dart270 [ Thu Apr 20, 2017 3:15 am ] |
| Post subject: | |
Nzpete, The stock blocks can handle a lot of milling/decking. Some people have taken 0.200" off the deck surface and raced them. I would not worry about 0.080" total. Assuming all other components are stock, you should end up with somewhere around 8.5 or 9:1 static compression ratio with an unmilled head. Where are you located in En Zed? I spent 6 mo in Wellington back in 2005 and travelled around quite a bit. Loved every minute of it. Happy building, Lou |
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| Author: | hyper_pak [ Thu Apr 20, 2017 7:33 pm ] |
| Post subject: | decking |
I know it's more work, but here is what I did. After boring I brought it home installed one piston and measured deck height. Then back to machine shop, .091 deck and I got 10.0 to 1 compr head ession with my shaved head. Stock TRW .060 pistons. My had been shaved .090. |
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| Author: | Killer6 [ Fri Apr 21, 2017 7:19 pm ] |
| Post subject: | Re: 225 deck height |
Quote: Sorry this topic probably has been done to death, but I can't think of the right words to enter into search function.
What lift cam are You planning on running? The only issue You may runI current have a block,getting bored, and it will be fitted with crankshaft, pistons and rods from another engine. The block appears, when comparing it to a virgin block to have already been shaved 60 thou. I've heard from lots of people that the pistons have a reputation of been down the bore a long way at tdc. I know the right way would be to assembly it, measure and then surface grind, but what I'm after is whether I would be safe to ask to have it surface ground another 20 thou, so it would now be 80 thou off. It's a five welsh plug motor, around 1970 vintage, would guess. Please let me know if you think I would be taking a risk to go to 80 thou without measurement.( I have heads that have never been shaved ) into is the pushrod getting too long, which is more likely the more lift you have, the cup will get close to/contact the rocker arm. Otherwise, You're good to go, maybe a little alt. bracket modding/shimming. |
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| Author: | nzpete [ Sat Apr 22, 2017 1:44 am ] |
| Post subject: | |
yes, I’m lucky to live in the en zed. Cool little country. Lots of corners, and something amazing around each one. Thanks for your help everyone. I was keen to go to 80 but my machinist was not too keen, so he is just going to clean it up, maybe 5 thou. Once I chose cam, and measure up, I may have to send it back in for some more maybe. Just a road car for cruising. Trying to decide on RV10, or maybe RV15. Will be running 2 barrel, auto with standard stall, 3:23 :1 diff, and will see most of its running between 50 and 120km/h. |
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