87 octane pure gas or 10% ethanol

[hotrodelrod]

I have a carbed 94 Merc. 200. I have been running high test ethanol but found a local station selling pure gas but only in 87 oct. Which is better for my motor? Thanks

[Nova Kaw 650]

If the factory calls for higher octane, then you have to run it, ethanol or not.

[rchavis]

The 87 octane ....thats what i would be running . Your engine can run on 86 octane

[EuropeanAM]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by hotrodelrod &raquo;</td></tr><tr><td class="quote">I have a carbed 94 Merc. 200. I have been running high test ethanol but found a local station selling pure gas but only in 87 oct. Which is better for my motor? Thanks</td></tr></table>

Unless this engine has been modified (heads modified for higher compression)- 87 octane is all that is required.

Higher octane fuels burn SLOWER and COOLER. Utilizing too high an octane will actually produce LESS POWER, results in an incomplete fuel burn, and can contribute to carbon buildup in the combustion chambers/exhaust.

[Nova Kaw 650]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by EuropeanAM &raquo;</td></tr><tr><td class="quote">

Higher octane fuels burn SLOWER and COOLER. Utilizing too high an octane will actually produce LESS POWER, results in an incomplete fuel burn, and can contribute to carbon buildup in the combustion chambers/exhaust.
</td></tr></table>
Right on!
You should read the arguments I get into on other forums when I post that info!

[EuropeanAM]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by Nova Kaw 650 &raquo;</td></tr><tr><td class="quote">
Right on!
You should read the arguments I get into on other forums when I post that info!</td></tr></table>

Trust me... I have.

I get email "invitations" to participate in such discussions on a pretty regular basis.

[hotrodelrod]

thanks for the help! Pure gas it is!

[haveme1]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by EuropeanAM &raquo;</td></tr><tr><td class="quote">

Unless this engine has been modified (heads modified for higher compression)- 87 octane is all that is required.

Higher octane fuels burn SLOWER and COOLER. Utilizing too high an octane will actually produce LESS POWER, results in an incomplete fuel burn, and can contribute to carbon buildup in the combustion chambers/exhaust.


</td></tr></table>

Some ppl are so hard headed about this. I'm glad you posted it. Maybe a pin should be applied.