Pistons
#1
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I want to start a thread so in the future ppl like me can elect what kind of piston set up is best for there application and budget. I myself am new to the world of miata's (one year deep), and I know somewhere down the road this will help those who don't know how to use the search button.
I've been reading about FM's forged piston setup for the 1.6L and 1.8L engines (I believe they are 9.0:1 CR wiseco w/ Carrillo rods)... but traditionally this may prove expensive to some people. I have also looked into the ebay route... they, on the other hand, promise forged pistons and rods for a much more affordable price; however they only carry 8.5:1 compression ratio wiseco slugs with Manley rods for the 1.6L B6. The folks at FM insist that the 9.0:1 CR is the best midpoint when it comes to compromising low-end with high-end boost for all miata's 89-05.
*Now is the time you guys should jump in with your knowledgeable opinions/ facts, and enlighten me and the public about Compression Rations (and types of pistons/rods) in relation with boost as well as for the normally aspirated if you want.
As for my miata, I am currently negotiating is a small ihi turbo setup controlled by a megasquirt unit that will supply a modest 14 psi to my 91 (short nose) 1.6. Obviously, being that I like my hard earned money, I'm trying to keep the costs as low as possible without compromising quality/ durability. This winter I plan on pulling out the one-six and getting it back on its feet (its full of noises and it leaks like hell).
I have heard about how the stock CR is actually not bad and boost friendly (9.4:1 I think)... so I came up with the idea to use stock pistons and simply reinforce with forged rods. Is this idea poop or might it actually be good? Are there other factors I may be over looking? I don't know, but that is why I need your input/ feed back.
I've been reading about FM's forged piston setup for the 1.6L and 1.8L engines (I believe they are 9.0:1 CR wiseco w/ Carrillo rods)... but traditionally this may prove expensive to some people. I have also looked into the ebay route... they, on the other hand, promise forged pistons and rods for a much more affordable price; however they only carry 8.5:1 compression ratio wiseco slugs with Manley rods for the 1.6L B6. The folks at FM insist that the 9.0:1 CR is the best midpoint when it comes to compromising low-end with high-end boost for all miata's 89-05.
*Now is the time you guys should jump in with your knowledgeable opinions/ facts, and enlighten me and the public about Compression Rations (and types of pistons/rods) in relation with boost as well as for the normally aspirated if you want.
As for my miata, I am currently negotiating is a small ihi turbo setup controlled by a megasquirt unit that will supply a modest 14 psi to my 91 (short nose) 1.6. Obviously, being that I like my hard earned money, I'm trying to keep the costs as low as possible without compromising quality/ durability. This winter I plan on pulling out the one-six and getting it back on its feet (its full of noises and it leaks like hell).
I have heard about how the stock CR is actually not bad and boost friendly (9.4:1 I think)... so I came up with the idea to use stock pistons and simply reinforce with forged rods. Is this idea poop or might it actually be good? Are there other factors I may be over looking? I don't know, but that is why I need your input/ feed back.
Last edited by Joe Perez; 11-14-2012 at 11:00 PM. Reason: Added line breaks.
#4
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That's very nice of you. But you assume that in the future people will USE the search button. We have no reason to believe this, since nobody ever does.
https://www.miataturbo.net/engine-pe...ns+forged+rods
Though I do admit that the default sorting is terrible, always do 'advanced search' then 'sort by relevancy'. This was #10 on that list.
https://www.miataturbo.net/engine-pe...ns+forged+rods
Though I do admit that the default sorting is terrible, always do 'advanced search' then 'sort by relevancy'. This was #10 on that list.
#7
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Thanks Andrew. I'm also trying to make a piston choice. Can you elaborate on the differences further?
The 8.6:1 offers detonation advantages, but the 9:1 is touted for its off boost response.
If the car only sees 3-4 track events a year and the rest of the time its street driven, which way would you lean and why.
Also, another factor that would affect piston choice would be the turbo. Lets say you wanted to just break into the 300 whp zone.
Thanks for your help
The 8.6:1 offers detonation advantages, but the 9:1 is touted for its off boost response.
If the car only sees 3-4 track events a year and the rest of the time its street driven, which way would you lean and why.
Also, another factor that would affect piston choice would be the turbo. Lets say you wanted to just break into the 300 whp zone.
Thanks for your help
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Thanks Andrew. I'm also trying to make a piston choice. Can you elaborate on the differences further?
The 8.6:1 offers detonation advantages, but the 9:1 is touted for its off boost response.
If the car only sees 3-4 track events a year and the rest of the time its street driven, which way would you lean and why.
Also, another factor that would affect piston choice would be the turbo. Lets say you wanted to just break into the 300 whp zone.
Thanks for your help
The 8.6:1 offers detonation advantages, but the 9:1 is touted for its off boost response.
If the car only sees 3-4 track events a year and the rest of the time its street driven, which way would you lean and why.
Also, another factor that would affect piston choice would be the turbo. Lets say you wanted to just break into the 300 whp zone.
Thanks for your help
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Baller turbo pistons:
![](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/59928-pistons-81fi06.jpg?dateline=1352995732)
Roller-Wave forced induction pistons incorporate full stepped-quench pads to maximize (mechanical octane), a volume-biasing reflector trench on the exhaust-side, turbulators at the intersect of the valve relief's to increase mixture homogeneity, and piston skirt designs for minimal cylinder wall loading.
All 280hp ITR pistons:
![](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/59929-pistons-srhigh06.jpg?dateline=1352995732)
Road racers around the world run these Roller-Waves with ultra-high 19mm pin placement for use with the longest-possible connecting rods. Combined with 87.2mm stroke (ITR) cranks, these 85.0mm pistons net just below 2.0 liters. We stock both the pistons and the corresponding lightweight Crower rods.
![](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/59928-pistons-81fi06.jpg?dateline=1352995732)
Roller-Wave forced induction pistons incorporate full stepped-quench pads to maximize (mechanical octane), a volume-biasing reflector trench on the exhaust-side, turbulators at the intersect of the valve relief's to increase mixture homogeneity, and piston skirt designs for minimal cylinder wall loading.
All 280hp ITR pistons:
![](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/59929-pistons-srhigh06.jpg?dateline=1352995732)
Road racers around the world run these Roller-Waves with ultra-high 19mm pin placement for use with the longest-possible connecting rods. Combined with 87.2mm stroke (ITR) cranks, these 85.0mm pistons net just below 2.0 liters. We stock both the pistons and the corresponding lightweight Crower rods.