10.35:1 ...ish
CJ
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| comp ratio w/198 rods/protru https://slantsix.org/forum/viewtopic.php?t=39188 |
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| Author: | akbmotorsports [ Sat Feb 27, 2010 4:55 pm ] |
| Post subject: | comp ratio w/198 rods/protru |
hello. can anyone tell me about what comp ratio i will have after 198 rods and pro tru conversion. with 225 rods and stock flat tops now at .170 in the hole, 60cc chambers and will be 80 over. thanks, andy. |
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| Author: | ceej [ Sat Feb 27, 2010 5:19 pm ] |
| Post subject: | |
10.35:1 ...ish CJ |
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| Author: | akbmotorsports [ Sat Feb 27, 2010 5:26 pm ] |
| Post subject: | re |
awesome, that means i can save some $$$ on headwork as this one is ready to go and spend those bucks on the good pistons. thats a smidge higher than i wanted to go, but thats just something i will be forced to live with. thanks, andy. |
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| Author: | ceej [ Sat Feb 27, 2010 7:24 pm ] |
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...ish?  What are you doing for 80 over pistons? CJ |
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| Author: | akbmotorsports [ Sat Feb 27, 2010 8:20 pm ] |
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block is at .060 over at present, plan on using the weisco pistons. |
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| Author: | ceej [ Sat Feb 27, 2010 8:40 pm ] |
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Ah. What's the pin height? CJ |
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| Author: | akbmotorsports [ Sat Feb 27, 2010 8:50 pm ] |
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ha-ha, knew it wouldn't take long for you to ask me something i don't know (not hard to do!). i assume you mean wrist pin. what is the variable here? using stock 198 rods if that helps. |
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| Author: | dakight [ Sun Feb 28, 2010 5:17 am ] |
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Correct me if I'm mistaken, but I think the 198 rods are too long to use with stock type pistons. Most people use the 2.2L 4 cyl pistons. |
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| Author: | akbmotorsports [ Sun Feb 28, 2010 6:26 am ] |
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i am going to use the protrus, i included the measurment off the stock flat tops for reference only. |
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| Author: | Doctor Dodge [ Sun Feb 28, 2010 9:09 am ] |
| Post subject: | |
Protru = Wiseco piston As far as I know, the special metric "long rod" piston Wiseco is making for the 7.005 rod length SL6 have been made in 87.5mm & 89mm sizes. Let us know if they are now offering other sizes. (you will want a 88.25mm) Once you start thinking about the long rod 225 you have to use metric piston sizes. This combo uses the following size range. 87.5mm = 3.445 = .045 Oversize 88.0 mm = 3.465 = .065 Oversize 88.25mm= 3.475 = .075 Oversize 88.5 mm = 3.485 = .085 Oversize 89 mm = 3.504 = .104 Oversize I ran your proposed number with a .045 compressed head gasket and 6 cc of valve notch that are in the protru pistons and came-up with 9.7 "ish" static compression. You are on the right track. Long rod Slants work great. The Wiseco Protru pistons & rings are top quality Getting mid to high 9 to 1 static compression "out of the box", without head or block milling give you lots to work with... more options. With standard 225 engine builds (6.7 rod lenght) I am always looking for ways to get a little more compression into the build. With a long rod engine, I tend to look at ways to take a little compression out, which is a much better problem to have. DD |
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| Author: | akbmotorsports [ Sun Feb 28, 2010 9:38 am ] |
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after reading quite a few posts here, i seem to recall that 3.485 is a size that is offered and what a lot of people have used. i will be grtting these ordered later this week and will let you know what they have. i believe brian nutter is the contact here for the weiscos? my machine shop measures the pistons before they do the boring to ensure proper fit as opposed to just "80 over" standard bore. |
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| Author: | 66aCUDA [ Sun Feb 28, 2010 9:50 am ] |
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Most of the race guys are using the .104 over. But I have both, you won't be sorry. Frank |
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| Author: | 805moparkid [ Sun Feb 28, 2010 5:26 pm ] |
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Quote: ...ish?
they sell the .080 stock cast at summit with pins for 11.97 each!! What are you doing for 80 over pistons? CJ the real question is where to get .1 over! |
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| Author: | adiffrentcity [ Sun Feb 28, 2010 5:47 pm ] |
| Post subject: | |
Quote: Quote: ...ish?
they sell the .080 stock cast at summit with pins for 11.97 each!! What are you doing for 80 over pistons? CJ the real question is where to get .1 over! |
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| Author: | akbmotorsports [ Mon Mar 01, 2010 7:21 am ] |
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from the wiseco website, go to page 2 http://www.wiseco.com/Catalogs/ProTru/B ... vrolet.pdf |
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