Quote:
Originally Posted by RalliartRsX
x2. I think after a certain bore they just just resleeve the blocks
240KA: Also, to keep in mind; you have wet vs dry sleeves and FWD SR guys when they were sleeving for 90mm were having the sleeves drop because they were dry sleeved.
But that is a whole other story in itself. Mazworx has done the process and is very versed in doing this.
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To just explain some of what we do,
1) ALL blocks, not just aluminum are machined with a torque plate and all main hardware assembled to ensure the block stays in spec.
2) ALL blocks are cleaned after every machining process and allowed to fully cool down to ambient temperature before any further machining or quality control
3) A torque plate isn't removed from a block until final QC or assembly.
4) All forms of QC are double checked by two separate techs to ensure no mistakes get by
5) Most importantly ALL work is done in house with no outsourcing which leads to less chance of miscommunication and opportunities for mistakes to be made. All work is performed on CNC machines operated by trained professionals who've been working exclusively in the racing industry for years.
As per the sleeve comments, after 87mm we will sleeve blocks, 87mm is the "safe" limit for an SR before heat soak and cylinder wall distortion become a failure point.
Also all SR20 sleeves are "dry" sleeves, as the block can't physically accept Darton's wet sleeve (MID) meaning that once you sleeve an SR it's permanent and ruining a sleeve ruins the block. For this reason all machining on sleeved blocks is proprietary so that we can eliminate any failures associated caused by 3rd party actions. Also since the sleeves are permanent for SR's we often recommend going with a smaller bore size such as 86mm or 87mm simply so you have room to mess up because you can go up all the way to 92mm, however; that requires custom pistons. By leaving yourself several bore sizes available your block lives much longer.