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Hi, iwas wondering if anybody would know the gudgeon to piston crown heights of 186 and 202 engines.My reason being is to find a cheap way to lower the compression on my 186 for forced induction,thanks
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Hi MItcho.
The difference in stroke between a 186 & a 202 is 1/4" (0.250"), so the difference in their piston height would be half of that, i.e. 1/8" (0.125").
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So am i right in thinking that the 186 and 202 blocks have different deck heights? because that would have to be considered.
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Hi Mitcho.
No, the deck heights are the same, only the crank & piston pin height are changed. Even the rod length remained unaltered.
If you need a low comp 186, use 202 (flat-top) pistons, with the 186 crank. Calculate how big a section that is 0.1 |
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Thanks so much for the info,any chance of knowing the combustion chamber size in cc's of a closed chamber head.I know the open chamber head is about 60cc,thanks.
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Thanks so much for the info,any chance of knowing the combustion chamber size in ccs of a closed chamber head.I know the open chamber head is about 60cc,thanks.
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Hi Mitcho.
The official nominal figures are 45cc for the small & 54cc for the large chamber, but Ive seen them vary by more than 10cc. I think its best to get yours measured. They also vary from chamber to chamber in the same head, they are a very roug |
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Hi Mitcho.
The official nominal figures are 45cc for the small & 54cc for the large chamber, but I've seen them vary by more than 10cc. I think it's best to get yours measured. They also vary from chamber to chamber in the same head, they are a very ro |
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You are on the right track.
Fitting a turbocharged 186 with 202 pistons to lower the compression ratio is one of the oldest tricks in the book.
A goo |
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Ok great.Ive chased down a good closed chamber yella terra head to get closer to a suitable ratio, which raises another question.As the strata inlet manifold has six ports to mate up to the nine port heads three ports would it be worthwhile making a full
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Ok great.Ive chased down a good closed chamber yella terra head to get closer to a suitable ratio, which raises another question.As the strata inlet manifold has six ports to mate up to the nine port heads' three ports would it be worthwhile making a full
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yes you can remove the head bolt posts and fit dividers, as far as I know when mine was done the dividers were available, maybe check with some old time head porters to see where they get them from. edit: if you cant find any try Luigi (Geoff Coombes) Edited by user Tuesday, 4 December 2007 12:39:02 AM(UTC)
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yes you can remove the head bolt posts and fit dividers, as far as I know when mine was done the dividers were available, maybe check with some old time head porters to see where they get them from. edit: if you can't find any try Luigi (Geoff Coombes) Edited by user Tuesday, 4 December 2007 12:39:02 AM(UTC)
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Where these dividers made of cast iron?alloy?steel? and did the head stud boss keep it in position with no fillers likedevcon?
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Where these dividers made of cast iron?alloy?steel? and did the head stud boss keep it in position with no fillers like'devcon'?
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alloy, no devcon just some araldite the head bolt keeps it in place as well Edited by user Tuesday, 4 December 2007 12:58:51 AM(UTC)
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Could i use devcon to make the inlet port divider?,As i am not that confident on using an epoxy on the inlet for obvious reasons.If i could use devcon what type?
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Why do you want to run a 12-port head in a turbocharged application?
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Well,the strata inlet manifold has 6 seperate runners and in a perfect world 6 inlet ports would be nice.I also feel that the air/flow would be at a higher velocity at lower engine speeds having one port per cylinder.Anybody else had ideas like this or ex
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they also did away the divider altogether according to hot 6 mag useing short head bolts in the bottom of the inlet check it out cheers
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