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A20dth or a20dtr block only?

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  • A20dth or a20dtr block only?

    I have rebuilt 6 of these A20DTH engines over the last couple of years, and have interchanged parts from A20DT/A20DTH/A20DTJ etc, have also used crankshafts from the Z19DTH engine as they are exactly the same cranks, but would like to know if there is any difference between the BLOCKS ONLY of the A20dth engine and the A20dtr (the bi turbo), the reason being a friend of mine with a bi turbo A20DTR has had it seized and the garage he as took it to are telling him this is a specialised "rare" engine and its going to cost a lot to rectify, i said to him that i am sure the blocks will be the same as any of the A20D?? engines as the only difference will be the turbo/manifold and the ecu, i have cross referenced part numbers from the different engines and they are the same crankshafts/oil pump/head gaskets etc so i take it that the blocks are actually the same? i did go into local vauxhall dealers but they could not give me a part number for just the blocks as they only sold full engines? hope someone can help before my mate gets ripped off?

  • #2
    I have aA20DTR and best I know, and I have a fair bit of data built up, the block is essentially the same with the only exception being the low friction treatment of the cylinder liners, the stated benefit of this is low friction on startup so may not make any day to day difference [but i may caution the block/head is, withe the addition of a low friction treatment, probably made to a much tighter tolerance so a A20DTH block may not work without specialist input regarding valve clearance/piston sizing etc] , but as you said of obvious external components a lot of the upper internals are different, Heat treated pistons, and forged Camshafts, Cylinder Head, Cylinder Head Gasket, Sump etc have been modified to handle higher cylinder compression rates to 170 bar.
    Whilst I hope this is of some help I cant give a definitive answer.

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    • #3
      thank you buttons appreciated for reply given, its only the block i am interested in as thats the only part that needs fixing and i have block out of sri cdti that as already been line bored/crankshaft/bearings re conditioned and can be transferred straight on to his bi turbo head and fit all his ancillaries, i just thought the garage my mate as taken his bi turbo to be fixed is trying to make out its a special/different block to charge him more than usual, you know what people are like? i could not see Opel spending vast amounts of money on research/development to put a totally different bottom end on to one of there best selling cars just for an additional 20000 models? its normally just upgrades to the ancillaries and higher specs on some components, so thanks for the reply

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      • #4
        Originally posted by bullet291064 View Post
        thank you buttons appreciated for reply given, its only the block i am interested in as thats the only part that needs fixing and i have block out of sri cdti that as already been line bored/crankshaft/bearings re conditioned and can be transferred straight on to his bi turbo head and fit all his ancillaries, i just thought the garage my mate as taken his bi turbo to be fixed is trying to make out its a special/different block to charge him more than usual, you know what people are like? i could not see Opel spending vast amounts of money on research/development to put a totally different bottom end on to one of there best selling cars just for an additional 20000 models? its normally just upgrades to the ancillaries and higher specs on some components, so thanks for the reply
        Id agree with you, chances are the block is the same. It would appear for all 2 litre diesels the stripped block is the same. The only difference I know of is the low friction treatment of the cylinder liner, but i cant see that being an issue.

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