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  #141  
Old 09-27-2022, 11:20 AM
TXFlyGuy TXFlyGuy is offline
 
Join Date: May 2012
Location: Jazz Town, USA, TX
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Quote:
Originally Posted by PilotjohnS View Post
from what my experts say, this is not required; it may be an old wives tale. JMHO.
Yes, old wives tale. Very old.
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  #142  
Old 09-27-2022, 08:18 PM
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RV6_flyer RV6_flyer is offline
 
Join Date: Jan 2005
Location: NC25
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Quote:
Originally Posted by PilotjohnS View Post
from what my experts say, this is not required; it may be an old wives tale. JMHO.
Quote:
Originally Posted by TXFlyGuy View Post
Yes, old wives tale. Very old.
The doom and gloom of the switch to unleaded fuel eating valves in cars never happened on the large scale we were told was going to happen. Yes I am old enough that I never saw the problem of vehicles eating valves and developing upper cylinder wear when lead was removed from auto fuel. Yes I was driving cars when all auto gas had lead in it and was driving the same car when the switch to unleaded gas occured. I had four uncles in the auto repair and gas station businesses. My uncles did not get more work when the switch to unleaded fuel occurred.

Others talk about the wonders of Marvel Mystery Oil (MMO) being added to their fuel. IMHO, those that are worried about lead being removed from our AvGas can find a solution for the problem by adding MMO to their unleaded AvGas.

Please pass the pop corn as this thread is going to get interesting.

Using Duck Duck Go to search the internet, (people can say anything on the internet and do) one will find both articles saying removing lead from fuel will cause wear and articles saying removing lead has more benefits than short comings. I just want to see the RAW data and draw my own conclusion.
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  #143  
Old 09-27-2022, 10:39 PM
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hgerhardt hgerhardt is offline
 
Join Date: Oct 2006
Location: torrance, ca
Posts: 872
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Quote:
Originally Posted by RV6_flyer View Post
......Yes I am old enough that I never saw the problem of vehicles eating valves and .....
Ha! I'm old enough to remember that too, and I did indeed have serious valve seat recession in my 1966 GTO engine. It ran fine until a hydraulic lifter bottomed out and that cylinder started misfiring. Most exhaust valves were recessed about 0.05, but that one troublemaker recessed about 0.150!

After 1971, GM and pretty much all others started hardening the exhaust seats which fixed that problem.

What's that got to do with Lycomings? Absolutely nothing. They already have hardened exhaust seats (at least any of the ones we typically use today).
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  #144  
Old 09-28-2022, 09:55 AM
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rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 6,402
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Best practice for those considering EFI and mogas use in RVs:

Pump placement should be on the floor, not FWF

No drilled 90 deg fittings prior to the pumps, mandrel bent 90s are acceptable

90s are ok downstream of the pumps

-6 line for all plumbing

Return fuel from the regulator should go back to the tanks, never back to pump inlet

Never use winter gas in the summer. Drain out that old fuel if in doubt

Good idea to buy a Peterson/ Hodges Fuel Volatility Tester, especially as the seasonal changes in fuel formulations occur in winter/ spring/ summer
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RV10 95% built- Sold 2016
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Last edited by rv6ejguy : 09-28-2022 at 10:12 AM.
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  #145  
Old 09-28-2022, 10:06 AM
TXFlyGuy TXFlyGuy is offline
 
Join Date: May 2012
Location: Jazz Town, USA, TX
Posts: 553
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Quote:
Originally Posted by rv6ejguy View Post
Best practice for those considering EFI and mogas use in RVs:

Pump placement should be on the floor

No drilled 90 deg fittings prior to the pumps, mandrel bent 90s are acceptable

90s are ok downstream of the pumps

-6 line for all plumbing

Return fuel from the regulator should go back to the tanks, never back to pump inlet

Never use winter gas in the summer. Drain out that old fuel if in doubt

Good idea to buy a Peterson/ Hodges Fuel Volatility Tester, especially as the seasonal changes in fuel formulations occur in winter/ spring/ summer
Good advice!
For those in the North Texas area (DFW - Dallas - Ft. Worth), we have the same fuel year round. A special blend to reduce vaporization. The RVP is close to that of 100LL.
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Last edited by TXFlyGuy : 09-28-2022 at 10:17 AM.
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