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Blue 202 parts into 186.

Started by _GTR071_ , Jan 14 2007 03:39 PM

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27 replies to this topic

#1 _GTR071_

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Posted 14 January 2007 - 03:39 PM

Just bought a blue 202 thats been reco'd a while ago.
Now, that plan is to use the 202 crank and rods in the 186 block, because apparently the cranks are better balanced then the red cranks, and well, starfire rods; how can i refuse

Not sure what pistons i'll be using at the moment whether from the blue or red motor. Be using my yella terra head, ill be getting some straight cut timing gears, bit of a cam. In the department of manifolds, ill be using my 2 barrel redline manifold with a holley 350, which i can always later change for the WW2 strommy later on, and also its got extractors. Later on i'll be putting YT rollers on the top. Thats the plans for the moment. Tell us what you guys think. Cheers.

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#2 _Bomber Watson_

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Posted 14 January 2007 - 04:36 PM

conrods will fit. crank and pistons are difernet 202-186. 202 has bigger crank jornals and lower piston deck height.

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#3 FastEHHolden

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Posted 14 January 2007 - 07:47 PM

They can be turned down to fit...its a lot of work to end up with a 202.

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#4 _Bomber Watson_

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Posted 14 January 2007 - 08:18 PM

i was going to say that, but personaly i'd use a 202 block.

that said, there is method to the madness of turning down a 202 blue motor crank journals to fit in a 186 block. less bearing surface area= more hp, not a lot but a little. also you have more meat in the block and mains caps. that with the longer stroke and better balanced crank makes for a good race bottom end. i've seen a bloke at the drags do many a 10 second pass form a bottom end with that combination.

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#5 _GTR071_

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Posted 17 January 2007 - 05:26 PM

Yeah im going to use the 202 block now, its less mucking around, just gonna drill the block to suit my head

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#6 Mr Lc

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Posted 22 January 2007 - 07:47 PM

i would like to do the same thing i have all the blue motor parts and a 186, but i want to end up with a 208 motor wud it work out cheaper to just buy the prostroke kit or have the work done to the crank and buy the pistons and other parts.i think the prostroke kit is about $1200.

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#7 _Bomber Watson_

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Posted 22 January 2007 - 08:48 PM

you dont have to stroke a motor with a 202 crank to get 208, just bore it out + .060

186 and 202 have the same bore, just diferent stroke. get the mains journals on the 202 crank ground down so they fit into a 186 block, take her out .060 and you will have your 208.

that or stick it all in a 202 block and take her out .060.

that said, i only reccomend going out as far as you have to. ie if the motor is currently +.020 then go out to +.030. really, going out 60 thou from standard to a 208 will make bugger all diference. better off keeping your block good for a few more rebuilds. were seriously talking around one hp gain every 10 thou, its not worth buggering up a good block by taking it right out strait up.

that or you could look at getting the 202 crank offset ground a few thou... get to keep your good block but still have your madgic extra couple of cubes.

Edited by Bomber Watson, 22 January 2007 - 08:49 PM.

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#8 FastEHHolden

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Posted 22 January 2007 - 08:58 PM

I have spent almost $10000 on my 234....if I build one again I reckon I could do it for about $6000...mine has a few extra like alloy YT head and turbo kit..thats over $5000 there.

So no I don't think you can do a 234 for that...cheapest a N/A 234 would be about $2000

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#9 _Bomber Watson_

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Posted 22 January 2007 - 09:02 PM

sorry, didnt he say he wants 208ci???

your motor sounds like fun fastehholden.

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#10 FastEHHolden

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Posted 22 January 2007 - 09:14 PM

i would like to do the same thing i have all the blue motor parts and a 186, but i want to end up with a 208 motor wud it work out cheaper to just buy the prostroke kit or have the work done to the crank and buy the pistons and other parts.i think the prostroke kit is about $1200.

I was responding to MrLC.

I'm sure it would be fun..if I got it going. It was built to win Horsepower Heros back in 1996..the 6 cyl turbo class was only 137 HP then.

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#11 _Bomber Watson_

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Posted 22 January 2007 - 10:04 PM

i would like to do the same thing i have all the blue motor parts and a 186, but i want to end up with a 208 motor wud it work out cheaper to just buy the prostroke kit or have the work done to the crank and buy the pistons and other parts.i think the prostroke kit is about $1200.

thats why im confused

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#12 Mr Lc

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Posted 23 January 2007 - 05:24 PM

okay the 186 i already have has been bored 60 thou to make it 192 so if i have the work done to the crank and fit the starfire rods will that make it 208 ?? if so thats wot ill do because the pistons are acl flat tops

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#13 _Bomber Watson_

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Posted 23 January 2007 - 06:59 PM

yes, yes it will.

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#14 Mr Lc

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Posted 23 January 2007 - 08:28 PM

oh that is good i wil do that then, saves me quite a few dollars, how do worked holden sixes go on pump fuels i will have flat top pistons and a worked brand new yella terra head so the compression wil be fairly high i am guessin i will need to run it on premium unleaded ??

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#15 FastEHHolden

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Posted 24 January 2007 - 08:00 AM

Sorry Bomber...I didn't think prostroke did a 208..I thought the only 6 kit they did was 234.

MRLC..that would depend on how high.

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#16 Mr Lc

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Posted 24 January 2007 - 09:07 AM

yes they do a 186 to 208 and a 202 to 208 kit, they use a modified blue motor crank, resized starfire rods acl 60 thou pistons and acl bearings comes with piston rings aswel not sure what brand though.im not sure how much compression the motor wil have so i guess ill have to wait until i have the head work done and see what it works out to be i wil probably jus run it on bp ultimate or similar because it isnt goin to be my daily driver.

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#17 FastEHHolden

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Posted 24 January 2007 - 10:02 AM

It makes sense..PULP is cheap insurance and only costs an extre couple of $$ per tank...especially after you spend bulk dollars on new engines.

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#18 Mr Lc

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Posted 25 January 2007 - 12:06 PM

i agree i run all my cars on ultimate, i have jus never run a hot motor with higher compression before and wanted to know if ther will be any problems.

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#19 _Drag lc_

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Posted 25 January 2007 - 07:28 PM

mr lc, we are running 11.1to1 comp in our new "Race 202 :ZZZ:

" is your head a open or closed chamber? as the bigger the cam, the harder it is to get the comp up. we are running the new engine in at the moment on preium ulp we have not had any problems with it, but it was built to handle high comp. make sure you let the person that is doing the "head work" know that you are looking for higher comp so they can modify it to suit.

Thanks Hayden

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#20 Mr Lc

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Posted 26 January 2007 - 04:24 PM

the head is a brand new yella terra head so it shouldnt be that modified ?? i havent really sused it out that closely when it comes time to do the headwork i will chat to the guys and tell em what i want and wot we will do with it

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#21 _Bomber Watson_

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Posted 26 January 2007 - 08:23 PM

what hayden was asking is does it have the kidney shaped chamber (closed) or the normal one (open)???

heres a pick i took a while ago to show someone else, couldent find a open chamber head laying around (got one somewhere) so i scribbled in a line to show you how it looks...

Posted Image

the bit i drew in with red is where the open chamber heads open up to...if you get the drift now.

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#22 _Drag lc_

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Posted 27 January 2007 - 08:47 AM

yes D.J., is that your high performance head? also what i was really refering to was a standard head vs a high performance head is finished off diffrently in the chambers,but the same princaple is used weather it is open or closed chamber.
Thanks Hayden