BP6D build valve options - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members

Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

LinkBack Thread Tools Search this Thread
Old 02-05-2016, 11:35 PM   #1
Senior Member
Thread Starter
iTrader: (6)
Join Date: Sep 2007
Posts: 1,085
Total Cats: 30
Default BP6D build valve options

Hey guys,

I'm looking to do a mild head shave with a BP6D. Shooting for 160-170whp. Major parts list is the following.

-Maruha 264 degree intake VVT cam
-Maruha 264 degree exhaust cam
-Supertech light doubles/titanium retainers
-SuperMiata damper
-Boundary oil pump

Anyway, the question is, do I stick with stock valves or go with supertech +0.6mm back/undercut? Is the hp/$ there? I've been searching for days but can't find any information or results on these. Another option would be going back/undercut on the intake side only. I am avoiding going oversize as it doesn't seem to be a great payout for the headwork involved and my power goal. Any opinions?

Last edited by albumleaf; 10-21-2016 at 02:31 PM.
albumleaf is offline   Reply With Quote
Old 10-21-2016, 02:30 PM   #2
Senior Member
Thread Starter
iTrader: (6)
Join Date: Sep 2007
Posts: 1,085
Total Cats: 30

searched again, found my old thread. opinions?
albumleaf is offline   Reply With Quote
Old 10-21-2016, 03:23 PM   #3
Senior Member
iTrader: (1)
Join Date: Jun 2006
Location: Sweden
Posts: 1,391
Total Cats: 58

+1mm intake and stock exhaust size here, both ST.

Some will argue that +1 or even +2mm exh will help. My builder did not see the need for more flow there.
NiklasFalk is offline   Reply With Quote
Old 10-21-2016, 03:26 PM   #4
Ich verstehe nur Bahnhof
iTrader: (3)
psyber_0ptix's Avatar
Join Date: Mar 2012
Location: Northern VA
Posts: 3,708
Total Cats: 319

I'm running +1 valves all around. The +2 might need some massaging of the valve reliefs depending on what pistons (CR) you're using.
psyber_0ptix is offline   Reply With Quote
Old 10-21-2016, 03:45 PM   #5
Supporting Vendor
iTrader: (3)
emilio700's Avatar
Join Date: May 2005
Posts: 5,312
Total Cats: 1,335

+1 valves increase flow at all lifts. No reason not to other than budget. +1/+2 combo balances head flow, particularly on heads with no significant porting.
+2 valves usually require larger valve reliefs on piston crowns. Industry standard for aftermarket pistons is to include reliefs only for +1 valves.
emilio700 is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
miata parts clearance 90-05 package deal take it all gdnimr0d Miata parts for sale/trade 9 02-16-2016 07:24 PM
Alternative bp valve springs. mxnige Engine Performance 4 02-05-2016 08:21 PM
NC Clutch options to support Supercharged/Turbo power levels! FAB Fab9 Tuning - Miata Performance Parts 0 02-05-2016 03:38 PM
Why different cam gears? IcantDo55 General Miata Chat 17 02-03-2016 11:00 PM
Purge valve solenoid control with MS3-Pro? Eunos91 MEGAsquirt 9 02-03-2016 04:21 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 05:17 PM.