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So, iv heard a few different things from a few different people, and what i wanna know is, Is a coolant reroute a good idea or a bad idea?

people have told me that they redesigned the flow for the head so that it doesn't have cylinder 4 cooling issues, i just wanna see if this is right or wrong,
and if i should just do the reroute on me new motor?

Short answer is, "Yes do it."

Long answer is, "Do you really want the long answer?"

NitroDann wrote:Short answer is, "Yes do it."

Long answer is, "Do you really want the long answer?"

okay, well just checking, cause i was going to leave the thing stock but it the cooling issue is still an issue,
gotta get rid of that issue.

I dont really understand what you just posted, to be honest.

NitroDann wrote:I dont really understand what you just posted, to be honest.

in short,
if its a problem even on the new bpz3/ve,
gonna get rid of that problem, and do a reroute

Ideally you change the head gasket to an earlier one, however a VVT motors cooling is still improved with a reroute without doing this.

NitroDann wrote:Ideally you change the head gasket to an earlier one, however a VVT motors cooling is still improved with a reroute without doing this.

gotta get an oversize head gasket, 85.5mm, dont think a stock gasket would fit

Purchase an na8 headgasket, in that case. the na8 gasket and a reroute is the ultimate easy solution, and is pretty much ideal.

Zabinskii wrote:gotta get an oversize head gasket, 85.5mm, dont think a stock gasket would fit

Yeah, I just checked a couple of NA8 gaskets that I've got: 84.4.

manga_blue wrote:

Zabinskii wrote:gotta get an oversize head gasket, 85.5mm, dont think a stock gasket would fit

Yeah, I just checked a couple of NA8 gaskets that I've got: 84.4.

yeah motor has been built with oversized pistons,

NitroDann wrote:Purchase an na8 headgasket, in that case. the na8 gasket and a reroute is the ultimate easy solution, and is pretty much ideal.

why na8 head gasket? whats the difference?

http://www.miataturbo.net/race-prep-75/ ... ead-79930/

20 pages of in depth discussion to explain it.

The NA8 gasket that I'm using now came with every available port between the block and head fully open.

The one I had before that was maybe an NB one and there were 4 or 5 available ports blocked off. I ended up drilling them all out and opening them with a burr grinder before I fitted it. It's not easy to mod a gasket, they're hard as buggary and there's a risk of jamming removed metal in between the MLS layers but it is doable.

Paul, use a Cometic head gasket cut to 85.5mm. You can buy from Deckspeed or Fabre in Australia, or 949 racing or Trackspeed in the states. They use the NA8 / NB8A pattern. You will need to use a rerouted cooling system.

You can also use a Maruha head gasket, but they are very, very expensive.

zossy1 wrote:Paul, use a Cometic head gasket cut to 85.5mm. You can buy from Deckspeed or Fabre in Australia, or 949 racing or Trackspeed in the states. They use the NA8 / NB8A pattern. You will need to use a rerouted cooling system.

You can also use a Maruha head gasket, but they are very, very expensive.

i found a cometic one on 949 and its 102$ says suitable for 85.5mm but im not sure if it comes at 85.5 or if it can be cut to 85.5mm