Miata Turbo Forum - Boost cars, acquire cats.

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-   Engine Performance (https://www.miataturbo.net/engine-performance-56/)
-   -   going to get my a$$ ripped for this question (https://www.miataturbo.net/engine-performance-56/going-get-my-%24%24-ripped-question-30501/)

1990miata1.6 01-19-2009 05:38 PM

going to get my a$$ ripped for this question
 
Well took my block apart all the way today and what do i find bent rods. i guess that's better then snapped rods. so i started to think because i only want to make 300whp i wanted to know if the lower comp pistons from the 94 to 97 miata would work in the 99 miata block. so if it is possible let me know and if you know any one selling some 94-97 miata pistons and rods that would be great.

BoostedOneSix 01-19-2009 05:43 PM

As about Thirty people told me.
Search.
Lol.
Im sure those pistons will handle the power goal.
As far as fitment, As long as its the same bore and displacement, I dont see why not. And as far as me knowing anyone who has some, Well... This is the wrong section for that, search in the For Sale. ;)

Its funny because, I got my ass drilled because I didn something wrong, not knowing I did something wrong. But you, your title is " I know im gonna get my ass drilled " You KNOW you are going to, yet, you ask anyways =]

kotomile 01-19-2009 05:46 PM

How'd the rods get bent in the first place?

I don't know about the pistons, but keep in mind that Cr is not determined by piston dome/dish alone, the cc of the head comes into play along with the thickness of the headgasket.

1990miata1.6 01-19-2009 05:47 PM

i ask because the old post are the old post and today is a new day and some one might have more info then the old post will tell you but i did do a search last night for it. not too much info on people trying it that i could find

1990miata1.6 01-19-2009 05:49 PM

I have no clue i took them out and holy shit i have never see a rod s shaped before. and s shaped both ways. ill have pics once i get home

akaryrye 01-19-2009 05:59 PM

take a picture of your rod and put it in your sig

1990miata1.6 01-19-2009 06:09 PM

4 Attachment(s)
here are the pics of the rods and pistons

Joe Perez 01-19-2009 06:10 PM


Originally Posted by 1990miata1.6 (Post 355566)
i wanted to know if the lower comp pistons from the 94 to 97 miata would work in the 99 miata block.

Yes. The bore diameter of all 1.8 Miata engines is the same, and the wrist pin interface is also compatible.

Others have adequately covered the many other variables in play.

1990miata1.6 01-19-2009 06:16 PM

Thanks for all the info just one thing is there a dome on the 94 to 97 pistons like the 99 or no.

M-Tuned 01-19-2009 07:10 PM

Let me know if you need rods.. We have them in stock and ready to ship :)

Welcome to M-Tuned.com 2.0 - Miata Rods

You should be fine with our rods and stock pistons. I've got a lot of customers who have done just that.

TravisR 01-19-2009 08:12 PM


Originally Posted by 1990miata1.6 (Post 355589)
here are the pics of the rods and pistons

Thats heavy detonation, plastic compression deformation caused by extreme pressure on the piston crown. Over rev is always plastic elongation deformation. Looks like playdoe when you pull it apart. I'd slap some new stock rods back in there if you are not going for extreme R.P.M. An aftermarket rod in that case would not have made a difference. Think of it this way. You had 3 pistons making power and another spitting fire on your tubine blade for spooling. Its a feature, rock it out.

1990miata1.6 01-19-2009 08:20 PM

Ya i was getting mad boost crapp on wastegate 10psi 7psi wastegate and i was spoolin by 2600 7psi and 3000 the 10psi and the turbo started to glow red with out getting on the gas and when i added fuel just ran shitty so i did a comp test and found cyl1 had 115psi and the rest had 180 and i had a bad exhaust valve in cyl 1.

kotomile 01-19-2009 08:25 PM


Originally Posted by 1990miata1.6 (Post 355635)
Yeah, I was getting mad boost creep, up to 10psi. The wastegate is set for 7 psi and I was spooling to 7 psi by 2600 rpm and by 3000 rpm it had crept to 10 psi and the turbo started to glow red without getting on the gas. When I added fuel it just ran shitty so I did a compression test and found cylinder 1 had 115psi, and the rest had 180. I have a bad exhaust valve in cylinder 1.

Thought I'd make this readable.

TravisR 01-19-2009 08:28 PM

Reminds me of how we used to tune cars in highschool. When it glows bright red that means you add fuel right???!!! :giggle: No insult intended just reminded me of the good ole days.

patsmx5 01-19-2009 08:37 PM


Originally Posted by TravisR (Post 355632)
Thats heavy detonation, plastic compression deformation caused by extreme pressure on the piston crown. Over rev is always plastic elongation deformation. Looks like playdoe when you pull it apart. I'd slap some new stock rods back in there if you are not going for extreme R.P.M. An aftermarket rod in that case would not have made a difference. Think of it this way. You had 3 pistons making power and another spitting fire on your tubine blade for spooling. Its a feature, rock it out.

+1 Automatic anit-lag FTW.

1990miata1.6 01-19-2009 08:44 PM

None taken once i get it all put back im going to have the car dyno tuned one with 300whp and the other with 250whp.

Saml01 01-19-2009 10:11 PM

Can I please have your pistons and rods if you will be tossing them?

1990miata1.6 01-19-2009 10:39 PM

yaa if you want them take em but i must ask u have an extra fuel rail or no there in stamford ct if u dont mind i would like to keep my bent one

Savington 01-19-2009 11:05 PM

Does this forum look like an AIM client? Learn to spell and stop using stupid text speak. It's difficult to read and annoying.

1990miata1.6 01-19-2009 11:14 PM

Sorry i slip up some times. It was worst as you all may remember i got 76 replys on my ass about that shit.


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