The Cal-look Lounge

I am building a set of new heads for the Karmann .
Base is a set of Mexican 043 heads .
As per Thesamba chamber cc is 47 mm plus a 0.055 step giving a total 52 cc chamber .
But if i am not mistaking the step of 0,055 inch = 1,397 mm
1,397 mm with a 85,5 cylinder equals 8,02 ccm , so something is wrong there ...
I took out 0,8 mm out of the head , leaving me with 0,7 mm measured precisely on the milling machine .
While measuring my actual cc right now with the 0,7 mm step i come to 47 cc remaining

(https://uploads.tapatalk-cdn.com/20200119/6bda91f6e46a2954d1af115c8c302322.jpg)

With the actual setup of 1,3 mm deck height i would get a C/R of 8,2/1

Dont really get it .
An i doing something wrong ?
Reverting the calculation
Stock 1,5 Deckheight
Full step in the head 55,6 ccm
Would bring me to 7,17/1 which looks a liitle low to me .
Anybody can help me ?



Sent from my iPhone using Tapatalk

I measured the chamber on it own and it looks like that has 43 ccm .
Could that be ?


Sent from my iPhone using Tapatalk

a good volume page

http://cbperformance.com/v/enginecalc.html

A link and pictures on how to measure volume (Swedish) but good photo
http://peterclevarp.blogspot.com/2010/07/mata-forbranningsrum.html

/// M

Thanks for the links , i usually use the CSP calculator , I took out 0,3 more , so know i am at 45ccm , with Deck height of 1,3 i have a 8,5/1 CR . Enough for a CB 2280 cam with 36 Webers on a 1600 .
The Karmann got the long gearbox , so I prefer a torque cruising setup for once ;)
 


Sent from my iPhone using Tapatalk

I thought you would build a racer engine The cam (2280) for fuel economy
 The camshaft is very similar to the one sitting in the WBX engine
 It has very good on the lower register
A tip Do a three angle job on the head
/// M

Thanks , thats something i ve never done myself , what is the benefit of a 3 angle compared to the standard ?

Increased flow
If you have the time and energy I have a thread on a Swedish forum how to increase the flow with easy tools
 You can translate with googel    Some pictures are unfortunately gone (
If you click on the pictures, they can open up)
 But would think it is very helpful for you
Link https://boxerville.se/forum/viewtopic.php?id=10359
/// Micke

Thanks , i will have a look at it, nice interesting thread .
I guess google translate is going to be a good friend of mine during that time ;) 


Sent from my iPhone using Tapatalk

I was able to find the old manual valve grinding tools from a retired VW mech (started at Wolfsburg in ‘46) so ask around they were common tools years ago. The grinders flip over to give you the 3 different angles. You need a stand for the head, some machinist blueing and new or newly ground valves. It’s a good upper body workout and satisfying getting that perfect ’pencil line’ as Clyde Berg put it.

Do you maybe have a picture of the tool ? So i know a little better what to look for

https://johnmaherracing.com/tech-talk/3-angle-valve-job/

Mira valve cutter
Which has a cutting steel with profile (3 angles)

Ok here ya go. This is what real men used back in the day ; )
Notice the different angles of the cutters? One has the “down the hole” angle while the other one has the 45 plus the entry angle.
There’s nothing exotic about 3 angles and you can even go further.
The shafts index the cutter in the guide.
[attachment=1]

This looks really cool . I will keep my eyes open do find one of those things around here !
Thanks very much for pics!
What about the valves self . They usually come with only one angle . Do you rework them at the lathe ?
 

Valves are done on a valve grinding machine. Those machines are around too at some of the old school shops.
The angles can be done on valves but I’ve got no experience with that. I have re-used intake valves and had someone grind them for me but you can buy nice stainless Italian made valves for cheap (about $10 each). New valves are always recommended, especially exhaust. Stainless steel exhaust valves were a huge breakthrough for air cooled engines. The old valves were a time bomb waiting to go off!

I planned to put new ones in it for sure , i knew about the exhaust valves .
Thanks for the info , i think i have some shopping ahead of me ;)


Sent from my iPhone using Tapatalk

you can find these tools on ebay as well, not as good as the original ones used by vw, but they get the job done imo.
There is also a simular tool for grinding the valves.
not my photo's, not my tool neather unfortunately..

[attachment=1]
[attachment=2]
[attachment=3]

Glauco

valve grinding tool is from Neway (called the Gizmo). they also have realy good seat grinding tools like the one Martin S. pictured.

Glauco

The Neway cutters are fine for garage mechanics that do a set of heads now and then. With a little patience you can do a very nice job.  For professionals it is too time consuming.
"We" actually still use a Neway pro set on flat heads, since it is a little difficult to get those blocks into the Serdi ::) ;D

Thanks , for the actual set of heads i will stick to the single angle.
Too much different projects eating the time away . But i plan on to do the heads i gonna removed from A to Z , too see what i am capable to do at home .
I got a new set of valves from CSP , still wanna modify the „upper“ surface of the valve to make them flow a little better.
Not yet sure what to use to reshape them. I dont have a valve grinder . Was thinking about putting them into the lathe . Could break the edge to the 45 degree (without touching the 45 itself) and maybe sanding the upper surface smoother with a little swirl left into the upper surface



Sent from my iPhone using Tapatalk