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Posted: Sun Jan 11, 2009 9:07 pm
by CastleMGBV8
topcatproduction wrote:Hey Perry how's the porting going?!
I only have the exhausts to do on 1 head then my pair is done! Quite pleased with how it has gone although I know I could do more- but the car is going to be a handful without ported heads so I have nothing to lose by giving my porting skills a shot!
I am more interested in the exhausts as the supercharger will blow plenty of gas in through std ports, but getting it out is more of an issue! Still- it doesn't hurt to give the inlets some attention at the same time though eh?!!!
I have opened up the runners to gasket size (a lot!) on the inlets and exhausts all the way through, and taken a bit out from around the guides but I still don't have a press to remove them to port around them fully so that can be an upgrade in the future at some point. I also bulleted the ex. guides a little using a pointy carbide burr bit, smoothed the ex. ports with 150grit sanding rolls in a dremel but left the inlets rough to help with atomisation of fuel.
Finally I have de-shrouded the valves by champhering the head material around the valves (approx 100degs each), and was suprised at just how much I could open up the exhaust ports behind the valves! There is so much meat there, I think the internal diameter is about 28mm std which I have taken out to just shy of 30mm, and that is not cutting it too fine either! Of course all the ridges etc have been smoothed away too.
I am leaving the std valves in for now as I want to get the whole thing built and running before I keep pumping more money into it. Will post some pics when I finish and give them a clean!
TC
Tom,
Well done with the progress, don't forget that when the seats are cut for the larger valves you will need to remove the excess inner seat area that is no longer required or this will negate all your hard work.
Post up some pics when youv'e got them done.
Kevin.
Posted: Tue Jan 13, 2009 2:19 pm
by topcatcustom
Got a couple of pics but they don't show anything inside- thought I had taken a couple more! And no I haven't just opened up the ends- quite a bit of material has come off all the way through! Not taking much off the floors though as that doesn't help with the large radii keeping the air flow smooth etc etc.....
The exhausts are my prime interest and a bit more obvious when comparing to standard!
p.s. I haven't smoothed the exhaust runners yet in these pics
Posted: Tue Jan 13, 2009 2:47 pm
by sidecar
Very nice! I like the mountain of swarf on your work bench to!
Did you do the big step between the back of the valve seat inserts and the tracks? I did mine with a tungsten carbide burr, bloody hell the inserts are rock hard!
Pete
Posted: Tue Jan 13, 2009 3:05 pm
by ChrisJC
Have you got any pictures of the cutting tool you used?
Chris.
P.S. good job!!
Posted: Tue Jan 13, 2009 3:52 pm
by ian.stewart
Perry,
You can borrow my spare BVHs if you want to copy them.
Posted: Tue Jan 13, 2009 4:13 pm
by ian.stewart
Before I forget,
Source of RV8 big valves, this is the place I got my TVR challenge UBVs from well under 50% of the price of V8D and JE for that matter, Mine cost just over £220 for a full set on my doorstep. Phone up JEs and get a quote, you will then realise what a good deal these were.
Paul Ivey has been making Race valves as long as I can remember and I beleive he supplied TVR, JEs and V8D with their big valves,
Kingswood Farm Kingswood Road
Albrighton
Wolverhampton
W. Midlands
WV7 3AQ
01902 373770
Posted: Tue Jan 13, 2009 4:22 pm
by topcatcustom
Thanks guys
I forked out on a Snap-on die grinder
http://buy1.snapon.com/catalog/item.asp ... ir=catalog
and set of Snap-on burrs with it like these
http://www.matcotools.com/ProductImages/zk4.jpg
Which make REALLY easy work of everything- even the seats!
And I'm a bit ashamed of my bench
I always have a messy bench ('cos you can always find what you are after!(when its your mess!!!)) and when I moved into my grandparents shed (actually a 250ft long 40ft wide ex. chicken shed!) my resolution was to keep everything nice and tidy and organised which until I got to porting the heads was actually the case!
Is nice to have plenty of space- my V12 bike project is in there too as is my cousins mini pick-up, friends mgb & tr7's, and uncles '61 Sunbeam Rapier projects! So weekends are great! Here's my workspace (minus a couple of light tubes!) and there's about the same size area to the right which I have put a couple of nice long workbenches in and the welder etc so we are pretty well looked after!
TC
Posted: Tue Jan 13, 2009 4:34 pm
by ChrisJC
I wish my workshop was that size!
Chris.
Posted: Tue Jan 13, 2009 5:54 pm
by Wotland
Very good job Tom
.
I remember for an pair of heads I done for an friend we sandblasted inlet port after porting for better fuel/air mixture :
Exhaust ports were fully polished :
Posted: Tue Jan 13, 2009 6:07 pm
by topcatcustom
Don't think I'l be posting pics of mine after seeing those Dimitri!
They look fantastic, did you use the whole polishing method for the exhausts i.e. buffing etc?
Posted: Tue Jan 13, 2009 6:42 pm
by Wotland
For exhaust port after grindind, the port and guide boss area are stoned to smooth them. I finish by polishing with roll of aluminium oxide cloth and with fan grinder.
I do the same for the valve throat.
Posted: Mon Feb 02, 2009 4:06 pm
by topcatcustom
Thinking of buying one of these for doing my spring seats, does anyone know the inside diameter of the Crane DV springs that V8 Tuner sells?
http://cgi.ebay.com/ebaymotors/CCA-4722 ... enameZWD2V
...and the external diameter of the existing seat come to think of it! Can measure that tonight...
Why is there so much more good stuff in the States?!!!!! Trying to find specialist tools or proper tuning/racing stuff over here is crap!
Posted: Mon Feb 02, 2009 4:33 pm
by chodjinn
Ian do you have a set of Big Valve or Ultra Big Valve heads spare?
