Searched the ---- out of here and google multiple times, but still a few items that I can't make a final decision on - looking for any advice or thoughts! Engine is torn about, going to order everything very very soon.
I'll first lay out general plan/goal.
GT2871 .86 A/R
350whp goal (20-24psi)
93 octane (currently have WI kit on car, but I want to remove it, not have to rely on it)
Not DD, but not track only. Street driven most of the time, but able to handle track days, autox, spirited driving.
ARP head/main studs
BE oil pump
etc, etc.... basically what TSE does for theirs
1. Bearings. ACL race is the standard answer for MT. My builder's concern with them is they are super hard (good for race motor), which makes them much more likely to wear faster from scoring, etc.... Google search brings this up some too. Solution might be to change oil super frequent, etc...but maybe not the best option for mainly street car?
Is there some sort of good middle ground here? I looked into Clevite and King, but it seems they only make "aluminum" or "OEM replacement" bearings- I've also seen some failed Kings ones from FM built motors (bbundy). Clevite Trimetal series is what my builder mentioned as a good compromise, but yeah, seems like they do not make them for Miata.
ACL makes both the Duraglide and Aluglide for Miata... I'm thinking these may be the best for me---- THOUGHTS??
2. Pistons. Some good threads on here regarding compression ratio (one from like 2008). 8.6 are the preferred setup for track- low heat, most safe, etc. I was thinking 9.0 as a good compromise. I'm also planning on trying out "exhintake" intake cam swap to get a good bit more lift and duration for pretty cheap. I've been reading into dynamic compression and how cams/valve timing affect all that, and end result is I lose about 0.5 CR with the exhintake.....is my thinking of considering 9.5 static CR pistons for this build sane? 9:1 CR, stock cams DCR should be = 9.5 CR exhintake cam DCR. EDIT:
or should I just see the loss of DCR as a "gain" for even lower effective compression ratio and go with 8.6?
Overthinking this all to some degree I know, just trying to make the best decision based on my current goals.
Thanks in advance!