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aussiebill
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Group: Forum Members
Last Active: 5 Years Ago
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rick55 (7/9/2014)
I have a 272 ECG block bored to 292 +0.060" O/S. That's a total of 0.185" oversize. Yet to see how it lasts, though there was no drama for the machine shop.
This was the original engine for my 55.
Rick, read that and thought you must have a real good block and realise they all vary with core shift, wall thickness. I have had 272 blocks that wouldnt take more than the 292 overbore. regards bill
 AussieBill YYYY Forever Y Block YYYY Down Under, Australia
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rick55
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Group: Forum Members
Last Active: 5 Years Ago
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I have a 272 ECG block bored to 292 +0.060" O/S. That's a total of 0.185" oversize. Yet to see how it lasts, though there was no drama for the machine shop.
This was the original engine for my 55.
Rick - West Australia
Do Y Blocks Downunder run upside down? Gravity Sucks!!
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OZYRAY
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Group: Forum Members
Last Active: 10 Years Ago
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I have heard of ECG blocks being bored a lot oversize, seems this block had some with thick walls. It would be worth spending the money to have it sonic checked as it could be a candidate go to a big oversize. Ted is the man to ask as he has bored many blocks, but he will say to get it checked I would think! I am putting together a C2AE block bored to 0.145" oversize, it was bored many years ago and has seen service so I just had it honed, had it checked and minimum wall thickness was 0.125. You wont know what you have until you get it checked, it would be nice to know how far you can go with it!
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pintoplumber
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The Crown Victoria Assn's Mike Suter told me he turned a lot of 272's into 312's. I wouldn't go any bigger.
 Dennis in Lititz PA
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CK
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Group: Forum Members
Last Active: 9 Years Ago
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Well I wouldn't super charge it. I thought I was being daring with my 272 block being bored 3.78" 292 - 30upI've read they will go 3.8" yet not all of them. |
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brainfreeze
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Group: Forum Members
Last Active: 5 Years Ago
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steinauge (7/1/2014)
I would have the block sonic checked.You are this far in now and these are not modern thin wall castings . your block may well be perfectly safe.i can't find any information on anyone boring a 272 this large, and it was also pointed out by OZYRAY its already .175" oversize, shop said i have to go at least another .020" but only pistons i can find are .030" over 312... so that means the block would end up being bored .205" oversize
ide say thats a recipe for split walls?
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steinauge
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Group: Forum Members
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I would have the block sonic checked.You are this far in now and these are not modern thin wall castings . your block may well be perfectly safe.
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brainfreeze
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OZYRAY (6/23/2014)
Is your bore diameter really 3.80? That means the ECG 272 block has been bored 0.175 oversize, thats about the most I have heard of , amazing! must be a bit thin in the walls though..went and saw the bloke at the machine shop, he said it definitely has 3.80 bore, and told me to find 20thou oversize pistons, i don't know if its worth getting it sonic tested or just get my other 272 built to a 292 with the ECZ-G heads, ECG-B manifold and the high ratio arms that I've got... thats probably a much better option
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Ted
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brainfreeze (6/22/2014)
when choosing a camshaft, what are the main things to look at?Advertised duration, duration at 0.050", lobe lift, and the lobe centerline angle are four camshaft characteristics to look at. The lobe lift can then be multiplied by the rocker arm ratio for a theoretical lift at the valve assuming the valve train geometry is in the ball park. All these can be manipulated to affect different aspects of the engine's performance. As a very general rule, small duration cams with wide lobe centerlines concentrate on low rpm performance and a smooth idle while larger camshafts concentrate more on higher rpm performances at the expense of reduced torque and worse idle characteristics in the low rpm ranges.
  Lorena, Texas (South of Waco)
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CK
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Group: Forum Members
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I think it starts with compression ratio, and then suit a cam to that. The higher the rev range the lower the actual volume in each cyl. cycle and compression drops, so the compression is raised to ensure all hydrocarbons burn. Obviously the engine makes more power though because its firing more often.
However if you consider Ted's cam were the profile is different as it opens quick and not so high a lift, he also has a larger separation 110* were most cams open slower and higher lift. These are things you need to consider. |
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