Discussion in 'Engine & Transmission' started by rstucke, May 10, 2021.
about to recon an 1800
It'll be 2ltr
And there's a few more engines for sale
Trans for sale @rstucke is 1800 trans renovated to 2 ltr?
What's the difference? What work may you have done?
What engines have you coming up for sale?
Sorry, brain fart. 1800 engine (I was negotiating for the auto trans but didn't get there)
Changed the title
Will post pictures as I go.
This engine is in a bad way
Going to turn it into a nice STD runner
What's been 'hammering' the sides of the pistons? Age/miles or bad fuel?
yeh, it's pretty bad
the lower section of a couple of valve guides broke off, disintegrated and your looking at the result
Both heads are obviously also trash.
be interesting to see what the bottom half is like when I strip it
May not be worth the effort.
So bad fuel. May be old heads pre new unleaded heads & ran on unleaded fuel for a bit without additive & lacked the lubricant of the additive & the heat won at the valve stem.
Bottom end may be not too bad depends on mileage. Any knowledge of history/mileage ? The top end fuel stuff doesn't go into bottom end if my guess is correct.
Split the case.........I'm interested .
No such animal as leaded heads on type 4.
So you're saying they were all made for unleaded fuel from 76 when unleaded wasn't even suggested in that year? Nice they anticipated the 1985 intro of unleaded fuel!
If that's the case I'd better seek out my retired mechanic & ask for a refund for the 90's rebuild to unleaded specs!
Sorry for the hijack @rstucke
Due to being aluminium heads they need valve seat inserts.
These are suitable for unleaded.
Plus unleaded fuel was introduced in other countries way before it was finaly dumped here because it stuffs catalytic converters.
Retarded brain development didn't matter in govt circles.
USA started getting rid of leaded fuel since the 70’s.
We were one of the last countries to go unleaded.
The VW heads could always run on unleaded
If you paid for an “unleaded” build you paid for nothing.
Yes - leaded fuel has a higher octane but the stock compression ratio of VW was low to start with.
I honestly thought ALL heads needed valve guides. Am I wrong in my understanding?
And that was the 'point of difference' re the head rebuild for unleaded specs? Perhaps @grumble could also comment.
Thanks guys. I'd be interested to hear Ricks take on this piston damage/how this rebuild unfolds.
Because VW have aluminium heads they need steel valve inserts to protect the aluminium.
If it is a cast iron head of a Ford or Holden then the valve seat is not necessary.
But the lead in the fuel is. So lead additive is need for those motors.
All the gumph of unleaded motors is about reducing the compression ratio for the lower octane fuels - but VW motors were always low compression in the first place.
Valve guides are different again.
They are the brass inserts that guide the stem.
Nothing to do with un/leaded fuels
How much extra premium did you pay, to get the “unleaded spec” rebuild, over the standard rebuild?
Thanks for that Barry. Not talking of seats....was always talking of stem guides. Sorry if I confused with laymans terms. I do presume that combustion temps/lubrication were different for leaded/unleaded fuel so discussion just about valve stem inserts to protect the head material? So we've got a valve settling on it's rested base .....The seat... & we have the vertical part of valve going up thru the head going thru the valve guide. I paid for the valve guide to be upgraded to unleaded due to the lack of 'leaded' lubrication!
have a read here
https://ratwell.com/technical/Heads.html#plomb - “leaded gasoline” section
“For better compatibility with unleaded fuel, VW introduced a newer hardened steel valve seat in the mid 60's to minimize wear. Every baywindow bus has seat material compatible with unleaded fuel (at least the fuel formula of 1978).
So what does all this have to do with VW heads? If your head rebuilder is making claims that he's modified the head to take the unleaded, lower quality fuels of today think about what he is offering:
bus heads have always been aluminum and used hardened valve seats
bus heads use bronze valve guides.
bus engines are configured for low compression ratios
late model CA model baywindow buses were equipped with catalytic converters
In other words, the factory built head was perfectly able to run for 100k miles using unleaded fuel so that's not the issue. VWs that used unleaded from the beginning were far better built than any budget head rebuild I know of”
Personally - I think your motor would have been just fine with the stock guides
So your valve guides were upgraded from bronze guides, to what, for unleaded?
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