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brainfreeze
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Group: Forum Members
Last Active: 5 Years Ago
Posts: 27,
Visits: 946
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thanks mate!
I've seen a few posts on other sites and seems a lot of blokes use the Y-270S
i guess once i know if my block is usable, ill post more info on what gear I'm using and see what people recommend
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OZYRAY
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Group: Forum Members
Last Active: 10 Years Ago
Posts: 12,
Visits: 661
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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..
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brainfreeze
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Group: Forum Members
Last Active: 5 Years Ago
Posts: 27,
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i measured it with verniers so its as accurate as i could with what i had... measured out to be 96.5mm... thats 3.799"
so i dare say that it would be 3.80 measured with a internal mic. also the pistons have ECZ on them so my guess is they're 312 pistons??
ive dropped it off at the machine shop to have it crack tested and measure the cylinder wall thickness, when i get this measurement ill post it on here for some advice too see if its usable, if not i have another stock 272 here which i will get checked and then bored to say 292 or slightly larger
I'm trying to upload a picture of the piston i had to bust out but its playing up, it had sat in the blokes shed for 8 years and not turned over, he bought it off someone else so had no idea of the size or anything |
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CK
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Group: Forum Members
Last Active: 9 Years Ago
Posts: 152,
Visits: 1.1K
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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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Ted
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Group: Administrators
Last Active: 1 minute ago
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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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brainfreeze
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Group: Forum Members
Last Active: 5 Years Ago
Posts: 27,
Visits: 946
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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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steinauge
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Group: Forum Members
Last Active: 10 Years Ago
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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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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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CK
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Group: Forum Members
Last Active: 9 Years Ago
Posts: 152,
Visits: 1.1K
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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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pintoplumber
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Group: Forum Members
Last Active: 59 minutes ago
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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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