A race bmw 316, m10, s14, m20, turbo, na, its been the lot!

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

can you not make out the difference by cutting the valves further into the head or will it still not be enough.

not really they would have to go a long long way back, it would as well as messing up the combustion chambers i'd have to take equill amounts off the ends of the valves, and thats with me checking clearances at TDC, typically they get tighter about 5 degrees after tdc

[mervhill]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

Whys that glen, im sure you could just as easily still have an m3 sat in your garage doing f. all

Shut up you the M3 would have been bought and driven, the Escort I decided to do too much too soon, didn't have the budget, or the time. I confess to making a mistake there

It'll get finished when it's finished. I'm not in any hurry (clearly).

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

Better to miss half a season to get it right than rush it to just get out racing eh? Although I must say it has made me glad I didn't buy an E30 M3 which I had my eye on at the same time as getting my Escort!

m3 bits are certainly a bit on the pricey side, std ones that is, tuning bits are eye watering, if it wasnt for race regs i'd consdider a duratec, although that said ultimate atmo tune the e30 lump still has a 50bhp advantage, at this rate i'll be bolting a turbo back on, now if i got 500bhp with a T38 and std cams and std evo head on 1 bar boost what could i get if i really tried

...

..



bankruptsy comes to mind

[stephen bahr]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

i'd have to take equill amounts off the ends of the valves

the valves do that themselves though

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

the valves do that themselves though

your right it has been known!

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

nothing much to report, im now waiting to see if my ebay woosner pistons from greece will turn up and are indeed what they are supposed to be

measnst while i nipped over to daves for a few hours and attacked one of my new heads, nothing too scientific about which one i chose i used the one which has already been heavily skimmmed in leu of my new pistons being a long way down the bores.

even using daves electric die grinder it too me hours just to do one port because so much metal has to come out, it also went on and off the flow bench a couple of times to check results, no great suprises i got a best of 158cfm @10 inch, which puts it in the league of a very good xe or a std duratec (im told that ported correctly a duratec will actually do 170) with a bit of detailed seat work i might just scrape 160cfm from it



so there we are one port down 3 to go, i did number 4 which was the one i broke through to the waterway on last time, interestingly beging a bit more agreessive with the porting on the base of the port fairly near the port face i got the flow without going quite so large on the overal port size. the nice thing is the cam i will use goes to 0.480 but by 0.400 the heads flowing 97% of its capability and after 0.480 theres no more flow to be had, obviously a higher lifting cam would still give more power because it would be at full lift longer, but as its £500 of ebay cams or 3K to put more radical cams in the decisions already made!

edit, this time with the bench working as it should i flowed both ports together, the result? not a bit of difference whether one or both ports were flowed

[Group4_Mark2]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

What kind of burrs do you do your porting with? Do you have any problems with the burrs loading up with aluminium?

I normally had a lot of problems with the burrs getting blocked with aluminuium until recently I started putting oil on the burr. Doing this helped a huge amount and I was able to remove lots of material was faster than ever before. Only problem is the oil would smoke a bit if I was grinding a lot. I looked into this and found that people use all sorts of stuff to keep their grinding burrs clean, candle wax, wd40, and some special porting fluids which are probably only available in the states.

Regards
Tom

[Tristan]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

What do you use Tom? I only ever use WD40.

[Group4_Mark2]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

I use a few drops of standatd engine oil as it sticks to the port while working and only needs to be added evey now and then. I have heard that wd40 is a bit toxic when it gets hot but that is only hearsay. I am thinking of getting some sort of wax to try. I heard that candle wax can work well but I have not tried it yet.

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

i use carbide burrs, as for lube, i use whatevers about! engine oil wd40, or silicon spray which seems to work best, if i do clog a burr the wire brush in my bench grinder soon gets it out.

edit, spent another couple of hours grinding today and did another port, so 2 down 2 to go,

silicon spray is deffo the way to go, infact i found i could spray it on a clogged burr and it would clean itself again when i resumed grinding

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

a quick meassure up this moring showed theres isnt quite enough clearance between the retainer and stem seal with the cam at full lift



fortunatly the cure will be quite simiple i shall just trim a bit off the bottom of the retainers seeing as the collets dont go right to the bottom of it

[Tristan]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

Would it be possible to cut the groove a bit higher up the stem ? Even if it doesn't suit you , I'm curious as to whether this can be done .

[david_white]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

i use carbide burrs, as for lube, i use whatevers about! engine oil wd40, or silicon spray which seems to work best, if i do clog a burr the wire brush in my bench grinder soon gets it out.

edit, spent another couple of hours grinding today and did another port, so 2 down 2 to go,

silicon spray is deffo the way to go, infact i found i could spray it on a clogged burr and it would clean itself again when i resumed grinding

Good stuff Graham, you are flying through those ports now.
I will bring you up a few different sprays that you can try when porting, you can then let everyone know which one works best. I don't use WD anymore as we have newer alternatives plus a few different silicone based sprays.

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

Would it be possible to cut the groove a bit higher up the stem ? Even if it doesn't suit you , I'm curious as to whether this can be done .

it could be done but would be tricky to get it in just the right place, get it slightly wrong and something wil break, much simpler and safer to just nibble a bit off the bottom of the retainer

[Graham]

Re: A race bmw 316, 240bhp Atmo M10 now going s14 power!

pistons turned up today shame the rings were missing!











as you can see thet have an extremely low compression hieght, no skirt to speak of and are very sexy bits of kit, not sure how well i will get on with them only having a single compression ring cos it wont rev hard enough to really only want 1 ring, but we will see, they are certainly very very light