From knowing nothing to having a Thunderbird supercharger on an m20b27i

[DER E30]

Sub'd! I like this a LOT!

Wonder how an M42 would do with a charger...

[Ether-D]

That's the edge of the valve that appears shiny. It's not actually shiny, it's the correct shade of light brown. A bit of an illusion.

[The Dark Side of Will]

Here you go.

Interesting... Higher res version?

Not sure if it's a trick of the photograph or not, but what's the polished little stripe on the lower right?

[Ether-D]

And the seat.

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[Ether-D]

Seats polished up nice when I lapped in the new (used but clean) valves.

[Ether-D]

Here you go.

[The Dark Side of Will]

You need to get the valves off the seats so you can look at the seats and the seating surfaces on the valves.

[Ether-D]

They looked a little black. Like dark metallic black. Ill get some pics…

[The Dark Side of Will]

Why are they leaky? Burned? Are the seats eroded?

An exhaust valve that's running too hot can contribute to detonation.

[Ether-D]

6 leaky exhaust valves. Not 6 bent exhaust valves. There goes that theory. Would leaky exhaust valves make a rattle similar to pinging?

[Ether-D]

Preliminary results are in!

I beheaded this little beast to look for signs of valves smacking pistons (this was my latest theory on the mystery noise). The pistons looked pretty decent, the exhaust relief looked slightly suspect, but I wasn't sure until I put some water in the exhaust ports and every single one leaked. Classic over-rev and consequent valve-float/benditude. I felt like I might have over-reved at the spring Brodeo because I had set the rev-limit too high in an effort to get my red-line over 5500rpm when I just needed to move the CPS closer to the harmonic balancer.

So, a tentative "Hell yes!" is in order. I'll get her put back together and off we go again.

[Ether-D]

Me too. I reckon I will. Once I get the motor sorted out with the eta bottom, I'll take it to someone to tune it.

[TheTacoMan]

I'd like to see this dynoed for science.

[Ether-D]

I'm 9500 miles into this little experiment. A little update on the engine noise. The rattle, chatter, whatever, is getting worse. It's now present at 2200rpm through 4500 or so. I think it's not long for this world. I really can't wait to see what it is.

Irrrrregardless, I'm gonna drop a 2.7 bottom in and have a blowed strokey. Sounds nice…

Would you like a blowed strokey? Why yes, yes I would.

[Ether-D]

Man, I think I'm gonna get the non-electronic guts for the trans. It would
certainly get me on the road faster. I think.

For those of you that want to follow the progress, here's the project thread for the hot-rod 335iS:
Link to Rat-Hot-Rod (idk) build...
It's still in the concept phase, but come on over and give me some feedback.