|
By brainfreeze - 11 Years Ago
|
|
so earlier this year i bought a 272, turned out to be locked up, I've stripped it down and had to break one piston out, but that bore still looks clean and undamaged, the odd part is it seems to be a mix of parts.
this is what i found; BLOCK - ECG-6015-A Cleveland foundry markings HEADS - ECZ-G Cleveland foundry markings CRANK - EC 29(then a big hole) lol RODS - EBU PISTONS - ECZ ROUGH BORE MEASUREMENT - 96.5MM = 3.80" (measured with vernier callipers) INTAKE - ECG-6065-B Cleveland foundry markings TIMING COVER - ECZ-G Cleveland foundry markings ROCKERS - australian passenger side (left side) all ECG-6564 australian drivers side (right side) a mix of EAN-6564-B1, EAN-6564-B2, ED-6564-B2
so im guessing its an australian 272, bored for 312 pistons, and they put the good heads, intake and high ratio rockers on it...???
|
|
By PF Arcand - 11 Years Ago
|
Your guess appears correct. Not sure on all the rocker casting #s, but the EANs I believe are the low ratio 1.43s.
|
|
By brainfreeze - 11 Years Ago
|
|
can anyone shed some more light on the rocker arms? i don't understand why there would be both high and low in the same motor, they all look exactly the same!
is there anyway to measure and check?
|
|
By brainfreeze - 11 Years Ago
|
|
i found this page talking about the differences between the high and low ratio rocker arms... ill check all mine against each other and see what the go is
|
|
By paul2748 - 11 Years Ago
|
|
Since the engine is a mixture of different parts, someone apparently put it together who may not known of the different ratios.
brainfreeze (5/22/2014)
can anyone shed some more light on the rocker arms? i don't understand why there would be both high and low in the same motor, they all look exactly the same!
is there anyway to measure and check?
|
|
By brainfreeze - 11 Years Ago
|
|
thats my guess, i have a spare 272 here so ill raid that for low ratio arms i guess or would it be better to source the rest of the high ratio arms?
|
|
By slick56 - 11 Years Ago
|
|
I think that Ted did a write up on using hi ratio for intake and standard rocker arms for exhaust. Helped with torque or something.
Search on here for rocker arms, or it may have been on Teds' website
|
|
By brainfreeze - 11 Years Ago
|
slick56 (5/23/2014)
I think that Ted did a write up on using hi ratio for intake and standard rocker arms for exhaust. Helped with torque or something.
Search on here for rocker arms, or it may have been on Teds' website
thanks mate!
|
|
By brainfreeze - 11 Years Ago
|
|
when choosing a camshaft, what are the main things to look at?
|
|
By slick56 - 11 Years Ago
|
|
brainfreeze (6/22/2014)
when choosing a camshaft, what are the main things to look at?
Here is a link to the Mummert site, main thing is that the oiling groove is deep enough,
http://www.ford-y-block.com/valvetrain.htm
|
|
By brainfreeze - 11 Years Ago
|
|
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
|
|
By OZYRAY - 11 Years Ago
|
|
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..
|
|
By brainfreeze - 11 Years Ago
|
|
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 |
|
By CK - 11 Years Ago
|
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. |
|
By Ted - 11 Years Ago
|
|
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.
|
|
By brainfreeze - 11 Years Ago
|
|
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
|
|
By steinauge - 11 Years Ago
|
|
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.
|
|
By brainfreeze - 11 Years Ago
|
|
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?
|
|
By CK - 11 Years Ago
|
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. |
|
By pintoplumber - 11 Years Ago
|
|
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.
|
|
By OZYRAY - 11 Years Ago
|
|
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!
|
|
By rick55 - 11 Years Ago
|
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.
|
|
By aussiebill - 11 Years Ago
|
|
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
|