how many hours are we getting out there before pulling heads for carbon cleanup or hand lapping valves? i have 170hrs on 3litre and heads been off twice for clean up and valve work. 

i am using decalin and marvel as fuel treatments with re-jetted ma3 carb fixed my fuel leaks and intake is tight any ideas on reducing carbon buildup?

anyone running a 3250? and how is it going? Are you satisfied with the engine builder if not yourself?.

i have spoken with Wesman's about this and my air fuel and timing setup is reasonable but he did recommend installing turbo valves from Clarks $185 for full set, which i did.

i am looking for ideas to reduce carbon buildup and valve wear to minimize removing heads to at least 500hrs. Everything i know about decalin and marvel they should reduce carbon buildup.  

Views: 242

Reply to This

Replies to This Discussion

I have learned a few additional things to minimize valve issues:  

Use clarks turbo valves

Compressed spring tension 100 to 110 pounds

Valve seats to approx .060, keep them narrow

Use Additive decalin in fuel

Run a step colder spark plug

I am not going to use marvel in the fuel as i have been 4oz / 10gal, everything i know about marvel it should reduce carbon buildup but going to give it a try anyway.

The first thing you should do is pull on that mixture knob a little bit.

RSS

New from Zenith:

Zenith Aircraft For Sale 

Classified listing for buying or selling your Zenith building or flying related stuff...

                                                     

Weather Maps


Custom Instrument Panels
for your Zenith
:

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.


Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits


Zenith Apparel from EAA:


Zenair Floats


Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz


Builder & Pilot Supplies:

How to videos from HomebuiltHELP.com

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.

 

Zenith transition and Sport Pilot training:

Quality Sport Planes
Cloverdale, California:

Wheels & Wings

Pro Builder Assistance

© 2019   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service