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 Post subject: B205 safe rev limit?
PostPosted: Tue Sep 10, 2019 9:22 pm 
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Barrelling Along
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Joined: Fri Nov 23, 2007 6:13 pm
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Location: Maidstone
Car Model: 9-5 Aero
Reasonably low miles engine (120k), probably to be fitted with fresh con rod bearings and sump dropped, still with standard internals.

What would be a safe rev limit for this?
I know the shorter stroke will let it rev a bit more readily and higher than a b235.
I just don't know at what point the pistons and rods reach their limits.

IIRC volvo valve springs are needed above 6000rpm and the water pump begins to cavitate around 7,000 or so.
Anyone with hard experience or useful info?

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 Post subject: Re: B205 safe rev limit?
PostPosted: Tue Sep 10, 2019 10:56 pm 
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Location: Devon
What's the maximum engine speed Trionic 7 can cope with, I wonder?

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 Post subject: Re: B205 safe rev limit?
PostPosted: Wed Sep 11, 2019 6:40 am 
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Barrelling Along
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Location: Maidstone
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I if remember rightly, from a management point of view T7 can rev higher than T5. I seem to remember T5 has a limit of 7,500 rpm....... which is about the point the hydraulic lifters need changing for solid ones. That also applies to T7 engines as well. However I don't think the pistons will tolerate that high, given their more fragile nature.

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 Post subject: Re: B205 safe rev limit?
PostPosted: Wed Sep 11, 2019 11:51 am 
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Didn't think the volvo valve springs as used on T5 heads work on T7 as the spring / valve / lifter design was slightly different.

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 Post subject: Re: B205 safe rev limit?
PostPosted: Wed Sep 11, 2019 1:07 pm 
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Barrelling Along
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Joined: Fri Nov 23, 2007 6:13 pm
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Location: Maidstone
Car Model: 9-5 Aero
beardydave wrote:
Didn't think the volvo valve springs as used on T5 heads work on T7 as the spring / valve / lifter design was slightly different.

Ah yes, good point.

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 Post subject: Re: B205 safe rev limit?
PostPosted: Wed Sep 11, 2019 4:57 pm 
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Joined: Wed Mar 24, 2010 4:25 pm
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Location: The cloud
Car Model: Three wheeler
McVities wrote:
beardydave wrote:
Didn't think the volvo valve springs as used on T5 heads work on T7 as the spring / valve / lifter design was slightly different.

Ah yes, good point.



T7 heads are a double valve spring set up in stock form.

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