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!

it seemed to take ages but yesterday i sorted the top hose and remote thermostat and bleed from head out, the main reason it too so long was that i had to do it out of lots of small secondhand bits of samco most of which were too short, the inlet side of the head is higher than the exhaust where the coolant leaves the head, so it needs a bleed to remove trapped air, without a header tank (current rad doesnt need one) i was a bit stick and plumbed it back into the thermostat which i wasnt sure would work, because the thermost is only slightly higher than the head and i'd be plumbing the bleed back into the same part of the system the main water flow goes which made me think all the water might go through the rail and non through the bleed, but i tested the bleed circuit with a bit of clear hose and it worked, you could deffo tell it worked when the clear hose softened and blew off and the engine squirted water everywhere.



didnt get much else done yesterday other than run out of fuel! then check the valve clearances once i'd got it properly warmed up, i swapped a couple of shims, dunno why i adjust them right when i build it because theres always a couple that are wrong once its run, i've got two inlets that are a about 4thou tight but will have to live with that for now as i dont have any thin enough shims to fix that and the chances of getting a couple before going to the rollers is slim, still if im 100bhp down i've got a ready made excuse _ not!

[team_zi]

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

running an 8 injector setup also means you can use std size injectors from a car with about half the bhp you are aiming for, much cheaper than buying a new set with a big flow rate, but you do need to make a second fuel rail, and not all injection systems will support 8 injectors.
.

Running injectors in batch mode also means that each single injector supplies the equivalent fuel of an injector of 'twice the capacity'.

[Graham]

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

as is often the case, one step forward and two back, infact today we prob had two or more steps forward and several back!

mapping showed up a couple of things today, 1stly the engine doesnt like either the really long or large dia diameter trumpets, emerald are developing something that i cant reveal but we used that instead, the next issue is using small dia trumpets were getting massive fuel stand off which we never really got round,

sadly though before working our way through all the inlet permutations it became clear that the cooling system was seriously overpressuring like one power run = 2 litres water in the catch tank!!!

so it looks like i've got to rip it apart again, which im not looking forward to.

otherstuff, well its doesnt rev, i say that it does, it just doesnt need to rev to make power, if the final mapping doesnt lift power higher up the rev range im going to have to change the diff ratio again, hopefulyl it will peak higher or hang onto it longer but the scores on the doors so far are

257bhp @6600 and a wonking great 243lbft cant remember where peak torque was at around 3K

[Roadsport]

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

This one keeps keeping you busy.

Made good power despite the issues you encountered. Even more so when you think of the revs it did it in.

Do you have any theories why it leaks pressure to the cooling system? head gasket?

[Tristan]

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

peak torque at 3k!!!!?? Did you map it on diesel this time? lol

[Group4_Mark2]

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

My brother has a turbo engined John Deere tractor that is pressurising the system also after an engine rebuild. Will be having a look at it tomorrow. Be interested in what is causing the problem on both engines

[caprimentle]

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

maybe its air still trapped in the head rapidly expanding over pressuring the system

[Graham]

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

nope, we'd had a couple of hours on the rollers before it developed, i took the head off this morning, the gasket was deffo leaking at the fire ring and in couple of places too, no idea why though, the blocks been refaced, as had the head, the bolts were still tight and i'd checked they werent bottoming out, the rollers are fully booked for weeks ahead, but dave has offered me the chance to be squeezed in on this coming weekend even though they dont work weekends, so i'm having to work fast, with time against me, i've decided to refit it with a std type gasket which i already had, this will cost me about a ratio on the compression due to it being 3 times thicker, so the machine shop shaved another 0.030" off it while i waited earlier today, meaning i'l only loose about half a ratio but thats it for this head now it wont take any more being taken off it, as the skimming has now hit the valve seat inserts, but TBH the head i chose to use has had a very hard previous life, and isnt upto doing duty on the next evolution of the engine anyway

[Ratters]

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

i'm not into all this over technical engine building stuff but it sure makes for interesting reading

nice work graham

[Roadsport]

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

Do you have any idea what caused the gasket to leak? Dodgy gasket ? Too mutch compression pressure maybe? Head overheating heat?
Can you check the block face witha feeler gauge to make sure it has not deformed in some places?

[exboyracer]

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

Fingers crossed the gasket holds this time Graham

[Graham]

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

Do you have any idea what caused the gasket to leak? Dodgy gasket ? Too mutch compression pressure maybe? Head overheating heat?
Can you check the block face witha feeler gauge to make sure it has not deformed in some places?

both block and head had been refaced and are dead flat, nope its wasnt overheating on either gauge or ecu temp sensors, cant see it being compression pressure, the engine was making 240lbft torque, which is only half what the same gasket held with the engine in turbo form so although the satic compression is higher dynamic is way lower.

its nearly back together now, just got to refit induction sytem cam cover and a few hoses, whilst in there i also sorted it the tight tappets

[david_white]

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

Good luck with it Graham, let's hope you've cured the problem now.
Seems weird that the faraday one didn't hold for you this time, especially as you're using the same block
And you know the head has had a good skim

Good results so far though. If you can get the power to keep climbing higher up the revs you'll have a fair bit of power, and that torque figure is massive. Maybe further mapping will move it all up the rev range for you.

[Graham]

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

Good results so far though. If you can get the power to keep climbing higher up the revs you'll have a fair bit of power, and that torque figure is massive. Maybe further mapping will move it all up the rev range for you.

we haddnt got as far as doing any timing trims so im sure it will go higher unless by some pure fluke we hit the ideal advance amount

[Group4_Mark2]

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

My brother has a turbo engined John Deere tractor that is pressurising the system also after an engine rebuild. Will be having a look at it tomorrow. Be interested in what is causing the problem on both engines

Looks like the tractor problem was also the head gasket. He used a non John Deere Gasket which is not as good as the original. Also the threads in the block were very corroded and Since the head had been skimmed the head bolts needed to thread in a little further than before. Even though he applied the correct torque setting it seems that the gasket was not properly clamped. Tapping out the bolt holes and a new gasket should hopefully cure his problem.

Graham, hopefuly your problem will be fixed as easily. Excellent torque and power figures. A little more time on the rolling road should yield even greater results.