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maximum bhp on a standard engine
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Old 09 Jun 2010, 05:04 PM   #1 (permalink)
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maximum bhp on a standard engine

hi all just a quick question how much bhp can a standard uk turbo engine stand before it goes bang? and whats the best engine for tuning with standard internals
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Old 09 Jun 2010, 05:14 PM   #2 (permalink)
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Re: maximum bhp on a standard engine

what are u planning to do an what year. ive got a 99 uk turbo an going for high bhp but im not to type to cane my car all the time
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Old 09 Jun 2010, 05:44 PM   #3 (permalink)
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Re: maximum bhp on a standard engine

at a rough guestimate 400bhp max (possible 1.75bar boost @say 5'500rpm) on a classic before it'll holes the block and spits pistons,all really depends on wether its a semi or closed deck block!!
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Old 09 Jun 2010, 05:53 PM   #4 (permalink)
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Re: maximum bhp on a standard engine

whats the best block to get. i have a v5 uk turbo. what does mine have
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Old 09 Jun 2010, 06:10 PM   #5 (permalink)
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Re: maximum bhp on a standard engine

it has the open deck block. only the earliest WRX/STI's had the closed deck block.
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Old 09 Jun 2010, 06:23 PM   #6 (permalink)
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Re: maximum bhp on a standard engine

is that the best or is semi or closed
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Old 09 Jun 2010, 06:31 PM   #7 (permalink)
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Re: maximum bhp on a standard engine

closed deck block is the best
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Old 09 Jun 2010, 06:40 PM   #8 (permalink)
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Re: maximum bhp on a standard engine

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closed deck block is the best
As above. If you can get hold of one it is definitely the block of choice.
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Old 09 Jun 2010, 06:40 PM   #9 (permalink)
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Re: maximum bhp on a standard engine

why didnt they keep the closed deck block through the models. i guess open deck is the weakest?
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Old 09 Jun 2010, 11:35 PM   #10 (permalink)
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Re: maximum bhp on a standard engine

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Originally Posted by rikimaru View Post
it has the open deck block. only the earliest WRX/STI's had the closed deck block.
just to butt on in the thread, are you saying that a 96 wrx import has a closed deck block or just the STi? and closed is better?
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Old 10 Jun 2010, 09:48 AM   #11 (permalink)
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Re: maximum bhp on a standard engine

'96 has an open deck block.

They are stronger as (iquote) "the cylinder bore is mated right to the surface of the block which gives it incredible stiffness and resistance to warping or cracking. These engines are created using the "sand-cast" or "lost-foam" methods. Both aren't terribly expensive methods of casting, but they'r emuch less accurate than using the die-cast method. This is why all Subaru engines currently use the die-cast, open-deck design."

Pics of the difference here;

Legacy Central - Open vs Closed deck

However, most tuned and standard imprezas out there are running open deck and the amjority without issues. I think good maintenance and displaying a little mechanical sympathy are far more important. Biggest worry for me on an Impreza tbh would be the bottom end going as a result of not doing the above, and that would be the same for either engine.
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Old 10 Jun 2010, 04:31 PM   #12 (permalink)
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Re: maximum bhp on a standard engine

thanks Rikimaru

So at the end of the day its dont really matter, unless you want to go over the 400bhp mark. and even if you do as long as you look after the engine eg good oil and fuel and the likes it will run fine. looking at the pics its clear to see the diffrence closed does just look stronger, but just not as refined in cut as a open.
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Old 10 Jun 2010, 10:49 PM   #13 (permalink)
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Re: maximum bhp on a standard engine

Quote:
Originally Posted by rikimaru View Post
'96 has an open deck block.

They are stronger as (iquote) "the cylinder bore is mated right to the surface of the block which gives it incredible stiffness and resistance to warping or cracking. These engines are created using the "sand-cast" or "lost-foam" methods. Both aren't terribly expensive methods of casting, but they'r emuch less accurate than using the die-cast method. This is why all Subaru engines currently use the die-cast, open-deck design."

Pics of the difference here;

Legacy Central - Open vs Closed deck

However, most tuned and standard imprezas out there are running open deck and the amjority without issues. I think good maintenance and displaying a little mechanical sympathy are far more important. Biggest worry for me on an Impreza tbh would be the bottom end going as a result of not doing the above, and that would be the same for either engine.
To throw a spanner in the works Wayne does the Spec C and the Spec C RA-R have a closed deck block?
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Old 10 Jun 2010, 11:17 PM   #14 (permalink)
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Re: maximum bhp on a standard engine

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To throw a spanner in the works Wayne does the Spec C and the Spec C RA-R have a closed deck block?
No they don't. They used the standard STi engines as their base with slightly better quality components in certain areas.
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Old 11 Jun 2010, 12:04 AM   #15 (permalink)
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Re: maximum bhp on a standard engine

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Originally Posted by rikimaru View Post
No they don't. They used the standard STi engines as their base with slightly better quality components in certain areas.
Cheers shame that they should have kept with the closed deck block in some of them anyway
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