Hardened Valves or Soft Please help...

alsner · Nov 13th, 2006, 09:48

Hi, can anyone please clear up a confusion that I have. I've been told by 1 source that I have Soft valves in my 89 745 2.3 Turbo B230ET (eng no 0000000000001287 first reg 16/05/89) and another hardened valves. As you can guess this has left me confused as to whether I should or should not be using valve additive for my car when using super unleaded.

ALi

LankyTim · Nov 13th, 2006, 12:48

That should be ok on unleaded, im sure it was only the earlier cars that had any kind of problem with only being able to run on unleaded petrol but someone with more knowlege than me will clarify pretty soon!

foggyjames · Nov 14th, 2006, 00:48

It's normally the valve seats which come in hard/soft varieties. AFAIK all OHC redblock engines have hard seats from the factory. Cars with redblocks were sold in California which has had all the emissions stuff (and presumably unleaded fuel?) since the 70s...so I guess they used the same seats in everything.

cheers

James

alsner · Nov 14th, 2006, 01:02

Thanks, so basically if I stick to super unleaded but over 98 (some is 97Ron) for the octane rating I'm going to be alright? However if for good measure I add a little additive every now and then I'm going to be ok

Ali

foggyjames · Nov 14th, 2006, 01:33

You can run a 740TI on 95 octane as far as I'm aware. The manual specifies 97 octane, but I'm not aware that the drop in octane hurts you at all until you start looking at elevated boost. I'd not bother with the additive...as far as I'm aware it's simply not necessary with these engines. I'd save yourself a few bob

cheers

James

alsner · Nov 14th, 2006, 01:38

Quote:

Originally Posted by foggyjames

You can run a 740TI on 95 octane as far as I'm aware. The manual specifies 97 octane, but I'm not aware that the drop in octane hurts you at all until you start looking at elevated boost. I'd not bother with the additive...as far as I'm aware it's simply not necessary with these engines. I'd save yourself a few bob

cheers

James

Cheers James, my manual specifies 98 4star hence the confusion... It will definately save a few bob because I paid £8.99 for 500ml that gives just under 10 fill ups.

ALi

Nov 13th, 2006, 09:48	#1
alsner In Volvo limbo Last Online: Aug 4th, 2013 03:26 Join Date: Feb 2006 Location: At home View Photos By: alsner	Hardened Valves or Soft Please help... Hi, can anyone please clear up a confusion that I have. I've been told by 1 source that I have Soft valves in my 89 745 2.3 Turbo B230ET (eng no 0000000000001287 first reg 16/05/89) and another hardened valves. As you can guess this has left me confused as to whether I should or should not be using valve additive for my car when using super unleaded. ALi __________________ Volvo History 1990 745 GLE (10 months) 1989 745 Turbo (16 months) I will return to the fold when the time is right. *It's Just a Ride* Bill Hicks

Nov 13th, 2006, 12:48	#2
LankyTim Missing the point Last Online: May 1st, 2024 18:59 Join Date: Nov 2001 Location: Stoke-On-Trent View Photos By: LankyTim	That should be ok on unleaded, im sure it was only the earlier cars that had any kind of problem with only being able to run on unleaded petrol but someone with more knowlege than me will clarify pretty soon! __________________ Tim 1968 Volvo 145 long term project. Currently without a Volvo daily driver.

Nov 14th, 2006, 01:02	#4
alsner In Volvo limbo Last Online: Aug 4th, 2013 03:26 Join Date: Feb 2006 Location: At home View Photos By: alsner	Thanks, so basically if I stick to super unleaded but over 98 (some is 97Ron) for the octane rating I'm going to be alright? However if for good measure I add a little additive every now and then I'm going to be ok Ali __________________ Volvo History 1990 745 GLE (10 months) 1989 745 Turbo (16 months) I will return to the fold when the time is right. *It's Just a Ride* Bill Hicks

Nov 14th, 2006, 00:48	#3
foggyjames 300 Register Keeper Last Online: May 9th, 2024 17:49 Join Date: Dec 2001 Location: Nottingham	It's normally the valve seats which come in hard/soft varieties. AFAIK all OHC redblock engines have hard seats from the factory. Cars with redblocks were sold in California which has had all the emissions stuff (and presumably unleaded fuel?) since the 70s...so I guess they used the same seats in everything. cheers James

Nov 14th, 2006, 01:33	#5
foggyjames 300 Register Keeper Last Online: May 9th, 2024 17:49 Join Date: Dec 2001 Location: Nottingham	You can run a 740TI on 95 octane as far as I'm aware. The manual specifies 97 octane, but I'm not aware that the drop in octane hurts you at all until you start looking at elevated boost. I'd not bother with the additive...as far as I'm aware it's simply not necessary with these engines. I'd save yourself a few bob cheers James

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