Engine Building Questions - 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. KMiata

LinkBack Thread Tools Search this Thread
Old 12-11-2010, 04:03 AM   #1
Junior Member
Thread Starter
iTrader: (2)
Join Date: May 2008
Location: Bethalto, Il
Posts: 318
Total Cats: 2
Default Engine Building Questions

Ok, I realize that my last couple threads have been All questions and have went no where. But i have recently decided to turbo my car after all and i have a few questions about pistons.

My Original plan was to just throw a turbo set up on the car but the more i thought of it And how many people get tired of just 10lbs I figured i would start with my engine.

My engine is the 2001 vvt 1.8 with 84,xxx miles on it. It does not need a rebuild However i Am going to pull it apart and Build it.

My plans are M Tuned rods, Billet oil pump. re balance crank and all new bearings stock head maybe some port matching small things but i do not want to port to heavily At this point.

I have built Motors before just Not a Bp.So i have a few questions for you guys. I know there is a lot of questions asked on this forum But i Have searched and only found vague Answers So my last option is to ask directly.

First question is With the pistons. I Know that i am 10.0:1 compression on this motor And with a turbo you would want to be lower than this. So my options are???
Aftermarket pistons, Wiesco or something.
Stock pistons from a 99??? will they hold up to 300Whp
Or should i just keep my stock pistons and coat them. And deal with the higher comp ratio

I will not have the turbo set up complete when the motor is done being built i will break the motor in and drive the car without boost for a few months. so i do not want to drop the compression down to 8.0:1 ,Also are the aftermarket pistons loud. And i Also Have heard that savington is running a set with a large clearance and the motor doesnt last as long. This is planned to be a DD car with some ***. Not a race car. So i Doubt i will bore it maybe just hone it. So What are my options for pistons.

Second, What about Over sized valves? in some threads i have seen people mention that they problems with the vvt setup as far as lift and interference.
I would like to keep the motor a non interference set up. It gives Me a sense of security When I beat on it.

I have moved so i no longer have my shop. So i will have the lower end Built be a local engine builder that has a good Rep. So i need to have all the parts and the game plan together before i drop it off.

If this has been answered 20 times like the churbo threads i Apologize in advance i did search and couldnt fine anything conclusive. I have my Flame suite on. But i appriciate any help reguarding the subject.

P.S. My Grammar Is Terrible I Am posting from My iphone Without Taptalk. So Spare me Please.
turbotyla is offline   Reply With Quote
Old 12-11-2010, 05:48 AM   #2
Supporting Vendor
iTrader: (31)
Savington's Avatar
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 13,228
Total Cats: 784

If you're doing forged pistons (and you should be), you're going to be boring the motor. No getting around that. My motor is built loose because I take it to tracks like Willow Springs and Calspeed and do 220kpa 5th and 6th gear pulls in 100*F degree heat - I probably put a max of ~20-25 hours a year on the motor and if it lasts 2 years I'm thrilled with that. I run .004" wall clearances - for a street motor with Supertechs I would bore to .0028" (mfg recommendation). For turbo gasoline motors, I recommend 8.6:1 compression.

According to Jason Cuadra, VVT heads and 8.6 Supertechs are already interference. If you want security, switch to a Gates Racing timing belt.

TSE offers assembled shortblocks based on your good running core. Contact me for details.
Savington is offline   Reply With Quote
Old 12-11-2010, 07:45 AM   #3
Junior Member
Thread Starter
iTrader: (2)
Join Date: May 2008
Location: Bethalto, Il
Posts: 318
Total Cats: 2

Damn, sav dropped some knowledge. So I guess I will bore and go for pistons. I figured that the stockers would be ok. But I guessed wrong.

So I'm guessing .020 over? And the shortblock idea
sounds good. I may contact you soon to check prices.

So anyone with piston preferences?

Thank you for the info sav
turbotyla is offline   Reply With Quote
Old 12-11-2010, 09:25 AM   #4
iTrader: (24)
shuiend's Avatar
Join Date: May 2006
Location: Charleston SC
Posts: 11,941
Total Cats: 723

Check the group buy section of the forum for Supertech piston group buy. Then talk to Adam at No Limit Motorsports about them and see if he will still give you a good deal.
shuiend is offline   Reply With Quote
Old 12-11-2010, 10:22 PM   #5
Senior Member
iTrader: (4)
Join Date: Jan 2008
Location: Falls Church, VA
Posts: 1,367
Total Cats: 16

I bought my supertechs about 2-3 months ago and Adam did them for $380 shipped.
ScottFW is offline   Reply With Quote
Old 12-12-2010, 09:13 AM   #6
Senior Member
Join Date: Sep 2007
Location: Alamo City, Tejas
Posts: 774
Total Cats: 1

When balancing the crank, consider doing the crank, pressure plate and fly wheel as a single unit. I saw great results from knife-edging the crank as well.

- L
l_bader is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
15x10 - 15x11 6UL @ 949 Racing emilio700 Wheels and Tires 143 05-21-2016 05:48 PM
01-05 Fab9 PNP COPs (used) FrankB Miata parts for sale/trade 6 09-30-2015 11:48 AM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 10:59 PM
VR6 to Miata Swap ScrapinMX5 Meet and Greet 8 09-28-2015 01:04 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 On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 03:03 AM.