WHat fails on the s4 engine? How to make it better?
#1
Rotary Enthusiast
Thread Starter
Join Date: Feb 2005
Location: Norway
Posts: 846
Likes: 0
Received 0 Likes
on
0 Posts
WHat fails on the s4 engine? How to make it better?
Hi!
Im rebuilding a s4 engine.
1.What cracks easily on the core engine?
2.what is the difference from the s4 irons to the s5?
3.Is there any way to make the s4 irons stronger so they can hold 400rwhp?
4.Is hardened studs from mazdatrix any point? 10mm or 12.5mm?
I have a 13bRE engine coming from jp, should i use that engine insted if its in good shape (i wont rebuild it this year).
Im gonna use gt35r turbo to achive 400rwhp.
Thanks
Sindre
Im rebuilding a s4 engine.
1.What cracks easily on the core engine?
2.what is the difference from the s4 irons to the s5?
3.Is there any way to make the s4 irons stronger so they can hold 400rwhp?
4.Is hardened studs from mazdatrix any point? 10mm or 12.5mm?
I have a 13bRE engine coming from jp, should i use that engine insted if its in good shape (i wont rebuild it this year).
Im gonna use gt35r turbo to achive 400rwhp.
Thanks
Sindre
#2
Engine, Not Motor
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
At over 400HP, you will get cracking at the dowel near the oil filter. Mazda improved this casting on the later S4 and all S5 and newer irons. You can swap on the S5 rear iron without a problem if you are porting the engine. Emissions passages do not line up though.
There is also a weak spot at the lower water o-ring grove on the spark plug side I believe (might be on the other side). The casting is very thin and weak and has a tendency to crack or rot.
There's no real way to make the S4 irons stronger.
It's generally not recommended to run studs on a street car. The stock tension bolts are spring steel, designed to keep constant tension as the engine changes length due to temperature. If you are worried about breaking things, look at doweling.
There is also a weak spot at the lower water o-ring grove on the spark plug side I believe (might be on the other side). The casting is very thin and weak and has a tendency to crack or rot.
There's no real way to make the S4 irons stronger.
It's generally not recommended to run studs on a street car. The stock tension bolts are spring steel, designed to keep constant tension as the engine changes length due to temperature. If you are worried about breaking things, look at doweling.
#3
Rotary Enthusiast
Thread Starter
Join Date: Feb 2005
Location: Norway
Posts: 846
Likes: 0
Received 0 Likes
on
0 Posts
Okey.. Maybe i just rebuild the s4 engine with a nice portjob and sell it with the stock turbo and wait for the 13bRE engine to arrive. Buying s5 irons and making new dowells its to mutch work atm..
The 13bRE engine can hold over 400hp without cracking?
Sindre
The 13bRE engine can hold over 400hp without cracking?
Sindre
#7
Banned. I got OWNED!!!
iTrader: (11)
Originally Posted by TehMonkay
I thought the S4 rear iron only cracks if you detonate the engine? Will me pushing 450 whp in my S4 turbo engine cause it to rack even if it's properly tuned?
my s4 na motor cracked at the dowell pin. its possible regardless of your tune or horsepower. granted a proper tune will probably help but its not a sure fire way to fix the problem
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM
KAL797
Test Area 51
0
08-11-15 03:47 PM