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Thread: 1.8 pinto head onto a turbo pinto block

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    1.8 pinto head onto a turbo pinto block

    Could you put a 1.8 head on a 205 block that has cossie piston and rods..
    I know you have to up the compression on a 2.0 head as compression ratio abit low but wasnt sure what it would do if you put a 1.8 head on??
    Would it make any diffence

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    Re: 1.8 pinto head onto a turbo pinto block

    It depends if the Exhaust valves are the same as the 1600 or the 2ltr, which I'm not sure of I'm afraid. Preferred would obviously be the 2.0ltr.

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    Re: 1.8 pinto head onto a turbo pinto block

    Its been a while since I did the calculations, but i think you would be better with a 1.6 head as a base and then modify it with bigger valves etc. Or just skim the 2.0 head.

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    Re: 1.8 pinto head onto a turbo pinto block

    Duck how much did you skim your head mate???

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    Re: 1.8 pinto head onto a turbo pinto block

    1600 head from an early non emax engine ( so not from a 165 block) is probably a better bet, you can skim 2.5 mm of a 2.0 head

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    Re: 1.8 pinto head onto a turbo pinto block

    Cant remember exactly how much it was now as it a while ago and didnt document that. I know we ended up at about 8.2:1

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    Re: 1.8 pinto head onto a turbo pinto block

    Do you know how far the piston should sit down the bore as wanna try see if they have decked the block??
    Cossie conrods and cosworth piston

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    Re: 1.8 pinto head onto a turbo pinto block

    Quote Originally Posted by theduck View Post
    Cant remember exactly how much it was now as it a while ago and didnt document that. I know we ended up at about 8.2:1
    Is it acceptable to end up with say 8.5:1?

    Or is it that that would reduce the amount of boost you could end up running?

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    Re: 1.8 pinto head onto a turbo pinto block

    Depends on piston quality and how well you can control boost pressure, fueling and ignition! Not the same as a pinto but my bike runs at 9.5:1 CR and 2 bar boost but all the above measures were incorporated.

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    Re: 1.8 pinto head onto a turbo pinto block

    Quote Originally Posted by Ricey1234 View Post
    Do you know how far the piston should sit down the bore as wanna try see if they have decked the block??
    Cossie conrods and cosworth piston
    i would expect around 0.020" 0.5mm

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    Re: 1.8 pinto head onto a turbo pinto block

    Quote Originally Posted by rallyrob View Post
    Is it acceptable to end up with say 8.5:1?

    Or is it that that would reduce the amount of boost you could end up running?
    TBH 8.2 or 8.5 isnt much difference, yeah its point three of a ratio, you would not want to be out by that much on a full on race motor with over 12.1, but down in the 8's it aint going to hurt

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    Re: 1.8 pinto head onto a turbo pinto block

    I agree that 8.2 or 8.5 is not that much of a difference but what you "want" depends on how you build the engine - fuel (gasoline/E85), engine management, required torque range and so on.

    IMO if you can get to around 8.5 with YB rods and pistons that's great as long as you dont need a 2 bar Holset Pinto turbo that lasts forever.

    Gustaf

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    Re: 1.8 pinto head onto a turbo pinto block

    So I take it that standard yb Pistons are still only cast an not forged anyway.

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    Re: 1.8 pinto head onto a turbo pinto block

    They are, but they are are good to like 450-500bhp

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    Re: 1.8 pinto head onto a turbo pinto block

    Quote Originally Posted by katana View Post
    Depends on piston quality and how well you can control boost pressure, fueling and ignition!

    Apart from Pistons all of that is controlled by your management system there's not that much you can do about that is there?
    Or is that just down to how good your management system really is?

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    Re: 1.8 pinto head onto a turbo pinto block

    Quote Originally Posted by rallyrob View Post
    So I take it that standard yb Pistons are still only cast an not forged anyway.
    they are really high quality, unless your shooting for 500bhp no need to upgrade strengthwise

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    Re: 1.8 pinto head onto a turbo pinto block

    Quote Originally Posted by rallyrob View Post
    Apart from Pistons all of that is controlled by your management system there's not that much you can do about that is there?
    Or is that just down to how good your management system really is?
    Fuel and ignition maybe via ECU but I'd use a standalone Boost Controller if running close to the edge of piston reliability!

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    Re: 1.8 pinto head onto a turbo pinto block

    Well it has pinto crank cossie rods and mahle piston only shooting for about the 250 mark so should be ok

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    Re: 1.8 pinto head onto a turbo pinto block

    Quote Originally Posted by Ricey1234 View Post
    Well it has pinto crank cossie rods and mahle piston only shooting for about the 250 mark so should be ok
    The trick with an Escort Cosworth Turbo Rally engine was to fit Cosworth 2wd pistons to the 4x4 engine and this would increase the compression to 8.6.1. The engine would reliably run all day with 2.2 bar boost pressure. Due to a 34mm Turbo restrictor fitted the engine would only make approx 300 bhp.

    You won't have a problem with std YB pistons for your engine as long as it's correctly mapped.

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    Re: 1.8 pinto head onto a turbo pinto block

    Quote Originally Posted by Ricey1234 View Post
    Well it has pinto crank cossie rods and mahle piston only shooting for about the 250 mark so should be ok
    ive used pinto cranks along wih std mahle pistons in ybs well north of 300bhp,

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    Re: 1.8 pinto head onto a turbo pinto block

    Quote Originally Posted by Graham View Post
    ive used pinto cranks along wih std mahle pistons in ybs well north of 300bhp,
    That's good to know.

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