Higher compression for 98 octane fuel? H22A Type S Engine
Thread Starter
Junior Member
Joined: Oct 2002
Posts: 206
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From: Melbourne, Australia
Higher compression for 98 octane fuel? H22A Type S Engine
Hi guys...
Ive put a deposit down for a JDMH22A Type S engine for $3200 AUSD (cheap
)
Anyway its done 57,000kms
I believe the JDM Type S engines have 11:01 compression
The engine is going to be rebuilt bottom to top...
My question is will this engine handle 12.5:1 compression with 98 octane
(Thats our Premium Unleaded)
The cylinder walls will be sleeved and possibly conrods replaced should be able to handle higher RPS beyond 8K maybe the crankshaft might need to be looked at?
Any comments appreciated...
Ive put a deposit down for a JDMH22A Type S engine for $3200 AUSD (cheap
)Anyway its done 57,000kms
I believe the JDM Type S engines have 11:01 compression
The engine is going to be rebuilt bottom to top...
My question is will this engine handle 12.5:1 compression with 98 octane
(Thats our Premium Unleaded)
The cylinder walls will be sleeved and possibly conrods replaced should be able to handle higher RPS beyond 8K maybe the crankshaft might need to be looked at?
Any comments appreciated...
Joined: Jul 2000
Posts: 2,392
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From: Snohomish county, WA, USA
Re: Higher compression for 98 octane fuel? H22A Type S Engine (Ryu)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ryu »</TD></TR><TR><TD CLASS="quote">Hi guys...
Ive put a deposit down for a JDMH22A Type S engine for $3200 AUSD (cheap )
Anyway its done 57,000kms
I believe the JDM Type S engines have 11:01 compression
The engine is going to be rebuilt bottom to top...
My question is will this engine handle 12.5:1 compression with 98 octane
(Thats our Premium Unleaded)
The cylinder walls will be sleeved and possibly conrods replaced should be able to handle higher RPS beyond 8K maybe the crankshaft might need to be looked at?
Any comments appreciated...
</TD></TR></TABLE>
12.5:1 would run very well on 98 octane.
Ive put a deposit down for a JDMH22A Type S engine for $3200 AUSD (cheap
)Anyway its done 57,000kms
I believe the JDM Type S engines have 11:01 compression
The engine is going to be rebuilt bottom to top...
My question is will this engine handle 12.5:1 compression with 98 octane
(Thats our Premium Unleaded)
The cylinder walls will be sleeved and possibly conrods replaced should be able to handle higher RPS beyond 8K maybe the crankshaft might need to be looked at?
Any comments appreciated...
</TD></TR></TABLE>
12.5:1 would run very well on 98 octane.
Member
Joined: Apr 2002
Posts: 2,905
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From: Superior, CO
Re: Higher compression for 98 octane fuel? H22A Type S Engine (Mike95lude)
I'd say if ya'll have 98 octane down under then that should be fine for 12.5:1 compression. I even think that 91 octane for our US prelude 10:1 compression is a bit to much.
Thread Starter
Junior Member
Joined: Oct 2002
Posts: 206
Likes: 0
From: Melbourne, Australia
Re: Higher compression for 98 octane fuel? H22A Type S Engine (RAB)
We have access to some Avgas (Aviation Fuel)
Anyway the guy told me that during crusing, the RON is at 115 however at full throttle it goes up to 145 RON you think it has some similar affects on say a inline 4 engine? perhaps a 50/50 or a 60/40 or even a 70/30 mixture
That might allow me to run 13:1 CR on race days....
BTW stock Type S valve springs retainers handle higher CR?
Anyway the guy told me that during crusing, the RON is at 115 however at full throttle it goes up to 145 RON you think it has some similar affects on say a inline 4 engine? perhaps a 50/50 or a 60/40 or even a 70/30 mixture
That might allow me to run 13:1 CR on race days....
BTW stock Type S valve springs retainers handle higher CR?
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