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| suprised 198 in 225 wrapping compersion ratio question https://www.slantsix.org/forum/viewtopic.php?t=28273 |
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| Author: | oklahoma joe [ Tue Apr 08, 2008 3:37 pm ] |
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So If I understand, a 2.2 piston will fit and raise the compression to 9.0:1. Will the pistons fit on the same rods and will I need to have the cylinders reborded to a larger size then the current 3.460, like 3.465. Is that the standard size piston or is it a over bored size for a 2.2. thanks Joe |
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| Author: | Doc [ Tue Apr 08, 2008 4:51 pm ] |
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The 2.2 piston works only if you have 198 conection rods. (7 inch center to center) What is the forging number on your con rods? The 3.465 is .5mm oversize for the 2.2 piston. Some books will also call it a .020 oversize. You will need to measure the pistons and most likely rehone the block to set the proper clearance. DD |
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| Author: | oklahoma joe [ Tue Apr 08, 2008 5:55 pm ] |
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I have the 198 connecting rods #2951260 mjc aavv 46 So will I need a 225 crank also. |
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| Author: | terrylittlejohn [ Tue Apr 08, 2008 6:47 pm ] |
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yes you need a 225 crank so that the long stroke +shorter piston will give you the better rod ratio and compression that your looking for. |
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| Author: | oklahoma joe [ Tue Apr 08, 2008 8:03 pm ] |
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between a new crank, new pistons, and rings. I think I will be spending more than my wallet has . So I am going to go with the 198 for now and later look into the 225 conversion. I going to need some money to finish the rest of the car. If not I will be looking at a nice engine and not have a car to put it in. Thanks for the infomation it helped to know my options Joe |
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| Author: | Bren67Cuda904 [ Tue Apr 08, 2008 9:18 pm ] |
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Quote: Bren how did you guys get a big bore on Eileen? If I remember right it was pretty large. Also, if you have essentially a 198, you could always find a 225 crank and make a "long rod" engine out of it. I know Doug favors those.
Found a perfectly cast BH block ('74) and sonic checked it. Also Hard Blocked the bottom half just to be on the safe side. Bore = 3.592
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| Author: | terrylittlejohn [ Wed Apr 09, 2008 4:40 pm ] |
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you will do fine with a 198cid just remember that most of your gain is in the head and finial compression ratio , so try for 9/1 comp and do a 3 angle cut and gasket match on the intake and exhaust, some blending on the bowl area after the 3 angle job will give you good flow to. good luck and remember, die grinders are your friend. 
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