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Old 24-04-2019, 06:24   #1
mathuex
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torque plate engine block

hello guys,

i have to increase the bore in my evo 6 engine block from 85 to 86mm.
it is really neccesary to use a torque plate while drilling?

some engine guys told me that the stock block is so stiff that there is
less to no torossion at standard tightening torque or bit higher.

what is your experience?

thanks in advance
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Old 24-04-2019, 06:24   #2
RG55 GAR
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Definitely need one to do it properly

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Old 24-04-2019, 08:03   #3
Mita
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Why not bore to 85.5?
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Old 24-04-2019, 10:38   #4
mathuex
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Quote:
Originally Posted by Mita View Post
Why not bore to 85.5?
because i had a "small" problem
the conrod on 2. cyl. was bent when upshifting @1,93bar boost peak.

even more the 1 cyl. wall on the piston ring area is corrode due to the
engine was more than 2 years not in use...

i can not say excatly how deep is the damage and because of that
i want 86mm to be safe.

here some pictures:




thanks
BR
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Old 24-04-2019, 12:15   #5
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Quote:
Originally Posted by mathuex View Post
hello guys,

i have to increase the bore in my evo 6 engine block from 85 to 86mm.
it is really neccesary to use a torque plate while drilling?

some engine guys told me that the stock block is so stiff that there is
less to no torossion at standard tightening torque or bit higher.

what is your experience?

thanks in advance
I measure up to 1 thou distortion when the head is bolted on, using APR2000 head studs at their standard torque.

It all depends how accurate you want the bores to be. Obviously, even if you use a torque plate, once up to operating temperature, the bores distort again in a different way.
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Old 24-04-2019, 12:31   #6
mathuex
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Quote:
Originally Posted by Clivew View Post
I measure up to 1 thou distortion when the head is bolted on, using APR2000 head studs at their standard torque.

It all depends how accurate you want the bores to be. Obviously, even if you use a torque plate, once up to operating temperature, the bores distort again in a different way.
To re-assemble the cylinder head and check the cylindricality would be the next step but if you already done that and found no differences its
unnecessary for me...

thanks
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Old 24-04-2019, 14:23   #7
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Head or torque plate, distortion is around 1 thou in multiple places if not bored with one fitted. I always use a torque plate.
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Old 24-04-2019, 16:46   #8
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Quote:
Originally Posted by mathuex View Post
To re-assemble the cylinder head and check the cylindricality would be the next step but if you already done that and found no differences its
unnecessary for me...

thanks
I measured the block without the head, with the TQ plate and with the head on, and it is as Cliwe said, up to 0.024 mm difference, depending on where you measure... Most distortion is at the top of the cylinder, across the block...
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Old 24-04-2019, 20:44   #9
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torque plate engine block

how many Cosworth cars didnt have torque plates when rebuilding the block and most high powered cars ? they ran just fine...ive used a torque plate because i good borrow one...if u have had ur crank checked and polished ? big powered motors running big BHP would help in compression

Last edited by war-machine; 24-04-2019 at 21:37..
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Old 24-04-2019, 20:44   #10
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Quote:
Originally Posted by kikiturbo View Post
I measured the block without the head, with the TQ plate and with the head on, and it is as Cliwe said, up to 0.024 mm difference, depending on where you measure... Most distortion is at the top of the cylinder, across the block...


any pics ?


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Old 26-04-2019, 18:31   #11
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any pics ?


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what kind of pics?
how it was measured or do you want the pic with all the measurements?
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Old 27-04-2019, 01:35   #12
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what kind of pics?

how it was measured or do you want the pic with all the measurements?


had to read the start of thread not sure why i said this...


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Old 27-04-2019, 07:51   #13
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Here is one example of the torque plate honing:


Years ago I mesured my 4g64 with torque plate on and I got 0.01-0.015mm distortion
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Old 27-04-2019, 08:45   #14
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Quote:
Originally Posted by war-machine View Post
how many Cosworth cars didnt have torque plates when rebuilding the block and most high powered cars ? they ran just fine...ive used a torque plate because i good borrow one...if u have had ur crank checked and polished ? big powered motors running big BHP would help in compression
yeah but how long did any of those cosworth engines last I remember in the old ford days those engines where constantly failing, smoking blowing head gaskets more than any K Series
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Old 27-04-2019, 09:55   #15
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Originally Posted by JOHNDQ View Post
yeah but how long did any of those cosworth engines last I remember in the old ford days those engines where constantly failing, smoking blowing head gaskets more than any K Series
And then you found a tuner that knows what he is doing and they became fine lol.
Funny enough the bore distortion on a YB is almost the same as a evo with the tq plate removed.

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