Ethanol in 1986 900T - what components are at risk? - Saab 900 Bulletin Board - Saabnet.com
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I'm hoping to assemble a clean body of information about converting a C900 to on straight ethanol. If I test this, it will be in a 1986 900T, so I particularly want data for that year and model. Please leave the poliical aspects aside - this is a technical project. Thanks kindly.
Today's Question: For a 1986 900T, is anyone aware of any fuel or exhaust system component which is known to be attacked (or known NOT to be attacked), over lengthy periods, by ethanol, either in E85 or in highproof (185+ proof) unblended ethanol, or in 170 proof unblended ethanol?
On these boards I've read
- conjecture that the injector O-rings *might* be attacked (however they are aside the fuel flow)
- conjecture that fuel line seals (e.g. at the fuel filter) might be attacked.
- the return line from the fuel pressure regulator is vulnerable.
- suspicion that even low concentrations of ethanol attacks the fuel level sender rendering it inaccurate.
Elsewhere (general ethanol-automotive literature) I've read
- for the first few tanks of ethanol, it tends to clean previously accumulated carbon and varnish from the system and this gathers in and fouls the oil and filter rapidly. So replace the oil and filter aggressively until this is cleaned out.
- If MMT (Methylcyclopentadienyl manganese tricarbonyl) was present in the gasoline, a thin deposit of manganese may have formed on some surfaces. Ethanol dissolves it and manganese accumulates on and fouls the O2 sensor. The fix is to anticipate it and replace the O2 sensor as needed.
The ethanol related threads in this forum and in the Performance forum suggest, without affirmation, that all other materials in C900 Saabs are tolerant of high concentrations of ethanol.
Note: Elsewhere I'm finding documentation that some materials used in engines are more strongly attacked by a blend of ethanol and gasoline than by either alone.
posted by 69.12.207...
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