Everything you ever wanted to know about petrol.....

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Re: Everything you ever wanted to know about petrol.....

Post by scimjim » Thu Jun 04, 2015 6:28 pm

Dennis Nicholas wrote:From my notes after a bit of research 2013.
SAE J30R6 (early 80s) not really for ETHANOL
SAE J30R9 hose for use with Bio ETHANOL up to 50%
I'm afraid your notes are wrong Dennis - link to SAE specification here

Essentially R6 is okay for carbs and over 5% ethanol, R9 is rated for higher pressure of injection systems and R10 is for systems where the hose is immersed in fuel (inc bio/ethanol)


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Re: Everything you ever wanted to know about petrol.....

Post by Roger Pennington » Thu Jun 04, 2015 7:39 pm

Yes, personally, I too prefer the screw-type clips, of the type specifically made for fuel hose, (like those illustrated above). The spring clips I've always found too fiddly and not really confidence-inspiring (as Phil says, you can't adjust the tightness for different sizes of hose).


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Re: Everything you ever wanted to know about petrol.....

Post by Dennis Nicholas » Sat Jun 06, 2015 3:53 pm

I'm afraid your notes are wrong Dennis - link to SAE specification here

Essentially R6 is okay for carbs and over 5% ethanol, R9 is rated for higher pressure of injection systems and R10 is for systems where the hose is immersed in fuel (inc bio/ethanol)[/quote]

Hi Jim
That was part of my read up.
I think you may have misread those specs....the last bit of the R6
"Exposure of these hoses to gasoline or diesel fuel which contain high levels, greater than 5% by volume, of oxygenates, i.e., ethanol, methanol, or MTBE (methyl tertiary butyl ether), may result in significantly higher permeation rates than those listed for 30R6, 7, or 8."
I take that to mean that you would get higher permeation rates than the rates listed for R6 with ordinary petrol.
The pressure part of the spec is of course of no interest to our low pressure systems.
Anyway at under £5 per meter for R9, the cost of renewing just under 2 meters is not too horrendous.

Dennis


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Re: Everything you ever wanted to know about petrol.....

Post by Dennis Nicholas » Sat Jun 06, 2015 3:59 pm

Roger Pennington wrote:Yes, personally, I too prefer the screw-type clips, of the type specifically made for fuel hose, (like those illustrated above). The spring clips I've always found too fiddly and not really confidence-inspiring (as Phil says, you can't adjust the tightness for different sizes of hose).
I agree those stainless screw type specially for fuel hose would be better but have not been able to find a supply.

The main point I was trying to get across was not to use ordinary Jubilee clips

Dennis


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Re: Everything you ever wanted to know about petrol.....

Post by toomanysabres » Sat Jun 06, 2015 4:08 pm

Dennis Nicholas wrote: I agree those stainless screw type specially for fuel hose would be better but have not been able to find a supply.
Dennis
Various sizes here http://www.carbuildersolutions.com/uk/f ... genumber=2


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Re: Everything you ever wanted to know about petrol.....

Post by AJL Electronics » Sat Jun 06, 2015 4:10 pm

And available from my site.


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Re: Everything you ever wanted to know about petrol.....

Post by philhoward » Sat Jun 06, 2015 4:59 pm

...and eBay...


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Re: Everything you ever wanted to know about petrol.....

Post by toomanysabres » Sat Jun 06, 2015 5:06 pm

Devon is a long way and the wet string keeps drying out. :lol:


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Re: Everything you ever wanted to know about petrol.....

Post by scimjim » Sun Jun 07, 2015 4:19 pm

Dennis Nicholas wrote:
scimjim wrote:I'm afraid your notes are wrong Dennis - link to SAE specification here

Essentially R6 is okay for carbs and over 5% ethanol, R9 is rated for higher pressure of injection systems and R10 is for systems where the hose is immersed in fuel (inc bio/ethanol)
Hi Jim
That was part of my read up.
I think you may have misread those specs....the last bit of the R6
"Exposure of these hoses to gasoline or diesel fuel which contain high levels, greater than 5% by volume, of oxygenates, i.e., ethanol, methanol, or MTBE (methyl tertiary butyl ether), may result in significantly higher permeation rates than those listed for 30R6, 7, or 8."
I take that to mean that you would get higher permeation rates than the rates listed for R6 with ordinary petrol.
The pressure part of the spec is of course of no interest to our low pressure systems.
Anyway at under £5 per meter for R9, the cost of renewing just under 2 meters is not too horrendous.

Dennis
I didn't misread it Dennis, I read the whole spec sheet and summarised it (above). UK fuel is CURRENTLY 5% max, so R6 is the MINIMUM requirement - and some of us have Scimitars with high pressure systems, so the pressure part of the spec is very important.


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
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