Just to let the forum community know I have had a Torque plate made for boring and honing 6A13TT's
for those who don't know the purpose of a torque plate I shall try and explain
When head bolts/studs are torqued up to specification during engine assembly the load of the bolts/studs on the block pull the cylinders out of round which messes up any piston to bore clearances you try and set whilst boring and honing the block.
This is where the torque plate comes in. its purpose is to simulate the load of having a head torqued down onto the block whilst machining the block. this means although after machining the bores may measure out of round when no torque plate/cylinder head is attached but when the cylinder head is bolted back on the load of the studs/bolts will pull the bores back within spec.
This means the cylinders will be much closer to being perfectly round during operating conditions. meaning better ring seal. and better overall performance. A must for a performance engine such as one planning on forged pistons or high boost applications.
Also when using aftermarket head or main studs such as ARP it always pays to check all tolerances and the extra load from the aftermarket studs needing to be torqued up to a higher spec than stock will distort the bores more than just using factory bolts.
When I got this Torque plate made I specifically had the head bolt holes made at 12mm diameter as to accommodate those who are using larger than stock head studs.
Anyway for anyone wanting their block to be machined with my torque plate attached feel free to PM me and I'm sure we can work something out.
Will hopefully be torquing it down onto a block tomorrow so can update with how much the bores pull out of round.
for those who don't know the purpose of a torque plate I shall try and explain
When head bolts/studs are torqued up to specification during engine assembly the load of the bolts/studs on the block pull the cylinders out of round which messes up any piston to bore clearances you try and set whilst boring and honing the block.
This is where the torque plate comes in. its purpose is to simulate the load of having a head torqued down onto the block whilst machining the block. this means although after machining the bores may measure out of round when no torque plate/cylinder head is attached but when the cylinder head is bolted back on the load of the studs/bolts will pull the bores back within spec.
This means the cylinders will be much closer to being perfectly round during operating conditions. meaning better ring seal. and better overall performance. A must for a performance engine such as one planning on forged pistons or high boost applications.
Also when using aftermarket head or main studs such as ARP it always pays to check all tolerances and the extra load from the aftermarket studs needing to be torqued up to a higher spec than stock will distort the bores more than just using factory bolts.
When I got this Torque plate made I specifically had the head bolt holes made at 12mm diameter as to accommodate those who are using larger than stock head studs.
Anyway for anyone wanting their block to be machined with my torque plate attached feel free to PM me and I'm sure we can work something out.
Will hopefully be torquing it down onto a block tomorrow so can update with how much the bores pull out of round.
