i am always amazed at how much knowledge one man can hold in ones head.and dave as everyone will agree is pretty amazing with his vast knowlegde of all things volksy.
can we stump him.
i am not sure ,but will give it a go,but i will have to go home and sleep on it.as i am drawing a blank at the moment.
if anyone has something please have a go.
i have a little one but it is pretty easy.
what does CCA stand for on a car battery.
matberry ·
Cmon Westi, you'll have to do better than that to stump Dave.
westi ·
ok ,what's pagey's pet hate.
hint. hint.it might be a colour people think that his car use to have on the front.lol
i got nothing i'm tired and stuck at work with no ride home.
you must have one,
f--king cabby's.
68AutoBug ·
CCA is Cold Cranking Amps or amperes.
on car Batteries...
thats not really a VW question...
Lee
What did 1951 model beetles have for only that year?
westi ·
why not.hey have batteries don't they.
68AutoBug ·
where was the bonnet pull knob on a 1968 beetle?
where was the bonnet pull knob on a 1969 beetle?
what did a 1969 beetle have that no others had?
hint: something to do with the heaters...
why are 1968 beetle wiper arms different from any other model beetles?
OK I'm going to bed now...
Raining nice in Scone....
LEE
vw54 ·
wheres the can of worms LOL
dangerous ·
I think they are talking to you Dave, I know f**k all.
vw54 ·
hey u can make muffins i dont know how to read the directions
vw54 ·
how did u go with THAT important phone call any progress
Dasdubber ·
I think we need to stump Dave with vw performance related questions though rather than just general vw questions.
Not that this will stump you Dave, but I know you are not overly fond of the K8 cam (there is a topic in another section you've already replied to) due to risk of valve train wear/harmonics.....looks like a K8 cam has been chosen and already dropped into the case for my turbo engine, can you elaborate on this a little?
I'm unsure of the origin (engle/cb performance etc as you mentioned there can be some differences in the k8 grind). Rockers will be Pauter 1.3, manton dual taper pushrods.....I'm keen to learn more!
Al
matberry ·
My K 8, 914 engine was built in 95, with GB273a springs set to .100" off coil bind. I think I bought it from KSR so maybe Pauter or European in origon. Saw 7000 rpm often enough, and worked f'n hard over the years, and never a spring issue.
Comments Dave
dangerous ·
Dasdubber wrote:I think we need to stump Dave with vw performance related questions though rather than just general vw questions.
Not that this will stump you Dave, but I know you are not overly fond of the K8 cam (there is a topic in another section you've already replied to) due to risk of valve train wear/harmonics.....looks like a K8 cam has been chosen and already dropped into the case for my turbo engine, can you elaborate on this a little?
I'm unsure of the origin (engle/cb performance etc as you mentioned there can be some differences in the k8 grind). Rockers will be Pauter 1.3, manton dual taper pushrods.....I'm keen to learn more!
Al
After seeing a number of customers with type one K8's have rocker arm, stud and pushrod failures, we had a K8 checked by our cam guy.
His simulation software showed that it had harmonic issues
that caused the failures and it was aggrivated by:
extra lash when warm,
rocker ratios that are large.
high rpm.
I can not recall if it was a Berg Equivalent,
or Engle genuine cam,
but our cam guy was able to reprofile the lobe to solve the problem.
We ordered a CB version of the K8, and it tested fine.
In the past I was not a real CB fan, but they have really done their homework of late, to supply the markets demands.
Pauter's would have been their own profile that had similar specs,
and their products are excellent in my opinion, (as you can tel by my purchases).
Provided the lash is kept tight(zero cold),
and the rocker ratio is kept on the low side of 1.4 you should be fine(if you like low power n/a 😂)
Of note was that extra tention did not solve the issue,
infact the damage was more severe, when the valvetrain lost control.
bajachris88 ·
Man i would luv to work where u guys are! great simulations and toys...
If u eva want a mechanical engineering intern in a little while, hook us up :P
westi ·
sorry that was to general,i ment technical as in performance questions or close .
ie.what should roller rockers be shimmed too.etc.etc.
not what head light fits these models.67 68 69 and what is the part number,
even theory questions like.how long is a piece of string.lol
hopefully you get the idea.
vw54 ·
ie.what should roller rockers be shimmed too.etc.etc.
OK OK i think yr taking the piss now send ME some questions hehehehehe
dangerous ·
bajachris88 wrote:Man i would luv to work where u guys are! great simulations and toys...
If u eva want a mechanical engineering intern in a little while, hook us up :P
I don't work for anyone any more.
I am an unemployed bum
that walks the earth, and gets into adventures, (just like Cane off 'Kung-Fu'),
....but I like to experiment with mind expanding drugs
all the while, having wild unprotected sex with many anonymous partners.
But you can purchase all sorts of simulation programs these days.
....but I like to experiment with mind expanding drugs rnall the while, having wild unprotected sex with many anonymous partners
NOw i know yr FULL Of it
LIFE IN THE LOW LANE ·
vw54 wrote:
ie.what should roller rockers be shimmed too.etc.etc.
OK OK i think yr taking the piss now send ME some questions hehehehehe
What's the phone and fax number for Vintage
HAHAHAHAHAHAHAHA
Now that's taking the Piss lol
One for Dangerous......
What time did you run on your first pass in your current car when it was blown??(without consulting the infamous book)
dangerous ·
12.55@103
LIFE IN THE LOW LANE ·
what is the diameter of a stock 2.0L type 4 gudgeon pin?
matberry ·
Too easy Brenndan
Does the longer conrod favour torque or revs while improving or not, engine longevity?
You there Birch...?????
LIFE IN THE LOW LANE ·
matberry wrote:Too easy Brenndan
Does the longer conrod favour torque or revs while improving or not, engine longevity?
You there Birch...?????
So what is it dangerous??
yeah Birch has gone very very quiet lol
vw54 ·
I was thinking of my belly stomach n getting some foood into my guts
OK so wots the first question 9789-1777
matberry ·
Ok Dave ['s]
With a late beetle engine bay, and dual 48 IDA's on scat manifolds, I was wondering how far I can raise the engine and trans before I have interference problems?????
westi ·
nice one.
but is there ever interference problems.not for me.
matberry ·
Cut cut cut cut........👍👍
vw54 ·
probley about 20 to 25 mm i would say
dangerous ·
vw54 wrote:how did u go with THAT important phone call any progress
He said he would not tell me anything,
until ALL the times were updated on the 'Aussieveedubbers
quartermile times list'
vw54 ·
i dont c a card from him LOL
westi ·
was that question for the rod for birch or danger.
i don't think birch would have a clue.
maybe he wants to A. phone a friend. B palm it of with some idol chit chat.C. alittle from column A and a little from column B
matberry ·
😂
westi ·
i take it you like that one hah.
vw54 ·
cracker
Vonripsnorter ·
68AutoBug wrote:where was the bonnet pull knob on a 1968 beetle?
(((Under the dash)))
where was the bonnet pull knob on a 1969 beetle?
(((in the glove box)))
what did a 1969 beetle have that no others had?
hint: something to do with the heaters...
(((Little lever in the front 1/4 panel carpit both left & right)))
why are 1968 beetle wiper arms different from any other model beetles?
(((You got me there, are you talking Aussie/nz assembled beetles here?)))
(((Note, I didnt have to look any of this up its straight off the top of my head so if I'm wrong thats ok, if I'm correct, thats sad😂)))
mactaylor ·
got one for you what is said to be the best ratio of valve to port measurement ratio? another, stoich for methanol?
dangerous ·
Hi Mac,
the smallest point of the ports in relation to the valve size is said to be between 85% and 91%
depending on valve angle and chamber wall shape.
Normally I aim for about 90 and then hand finish the high speed area, so the throat is actually an egg shape.
This time I will start with 88% intake and 85% exhaust before hand finishing.
From mem stoich is 6.4 but max power figure varies, I think mine is at 5.0 at the moment but would have to check my logger.
I would phone a friend but I have none,
just blokes I know.
Brennden, 24mm.
Matt, fu*#ed if I know,
cut, cut cut is my answer for that delema, but dont raise it more than 32mm,
that way you can use a bus nose cone and keep the shift rod in the tunnel.
Rod length is a whole book in its self.
By simple answer is to keep it as short as possible for easy fitment.
This way your pushrods are nice and short, and clearancing and barrel spacers are easy.
In theory wear would be less,
but even from one extreme to another,
say stock stroke with 6" rod,
to say, 86 stroke with 5.352" is only 2 degrees different angle at half stroke.
So wear difference would be minimal, and not even measurable with a change of 0.1" for example.
The general consensis is longer rods move the torque and power peaks up in the range,
but nothing measurable if cams are optimised
to the point where piston speed is maximum.
One degree of lobe centre or duration would cover the extreme that I gave for the example above.
You would gain more from the shortest rod you can fit due to the shorter pushrods giving better valve train stability,
and being able to use shelf cams instead of custom grinds.
That is the short version as I see it at this point in time.
Views and opinions change over time.
h ·
hey dave i need a definitive answer pls..
if it takes a week to walk a fortnight, how long is a piece of string?
🤓
dangerous ·
h wrote:hey dave i need a definitive answer pls..
if it takes a week to walk a fortnight, how long is a piece of string?
🤓
Medium I would say.🤓
2443TT ·
Ive gone one...
What is considered to be safe maximum pistons speeds assuming you are using a CP forged piston?
For that matter, what piston speeds does the your pauter engine achieve at 8000 rpm too?
Cheers,
Ian
dangerous ·
The rod bolt will be the limit with your 88 stroke.
I would have to look n my black book for the formula that takes rod length into consideration,
but with my 90 stroke and 5.7 rod I set the limit to 7750 so it remained within acceptable limits.
My current 82.5 stroke is not an issue, but the limit is currently 8400.
Piston mass,
combined with the accelleration give resulting FORCE,
that is so critical to that failure point that you want to stay clear of.
Remember from school,Force=Mass x Accelleration?
dangerous ·
2443TT wrote:What is considered to be safe maximum pistons speeds assuming you are using a CP forged piston?
For that matter, what piston speeds does the your pauter engine achieve at 8000 rpm too?
Cheers,
Ian
Just to clarify, it is not the SPEED that is a problem,
but the ACCELLERATION.
The maths for mean piston speed is stroke x rpm divided by 6.
This gives the piton speed in Feet per minute.
Anything over 4000 is high, but as i said above speed is not problem.
it is the sudden stop that will do the damage.
(actually it is the change in direction at TDC that is so tough on parts, bt you get the annalogy)
I have the accelleration formula in front of me but need to be able to type in, in forum version so you can understand it.
dangerous ·
OK.
practical limit of 100 000 to 150 000 feet per second per second,
is what the book says.
I would say 100 000 with stock parts and 150 000 with the best quality rod bolts , rods, and pistons.
[(rpm x rpm x stroke in inches) divided by2189]
multiply this by
[(half stroke divided by rod length) + 1]
SO,
8000x8000x3.465" divided by 2189
=101 293.9
x (1.732" divided by 5.7") +1 (=1.3039)
answer 132 078 ft per min
dangerous ·
That was the maths for 8000 rpm,
88 stroke(3.465 inches)
And 5.7 inch rod.
mactaylor ·
please explain reversion?
Cam ·
Okay... I've got one! Right out of my phantasy (deliberate lacking the F, considering how quickly things go downhill around here) scenario book 😂
*cracks typing knuckles*
Planning a road trip hunting out the best roads & tracks in Europe, mainly around Germany. Got my 'dub sorted except for engine & box...
Want 400HP that I can be ON more than off during the trip, 250KPH top speed and being delivered from a pushrod, flat 4 derived motor.
What would you recommend from the specials board? 😁
mactaylor ·
dont want much do ya!!!!
Cam ·
Westi started it dude 😀
h ·
😵💫 haha
westi ·
dave the muffin man.
what head torque for 14 to 1.
i have an issue with leakage
Stanley ·
"i have an issue with leakage"
I hope this is still related to the head torque and not just a personal problem..😀
dangerous ·
mactaylor wrote:please explain reversion?
That is the acid like substance you get after a big meal?
I use VW 10mm head studs currently,
torqued to 35 lbs with moly lube or anti-seize.
My blown engines also used Raceware studs in 10mm.
But also VW studs were OK if the tune-up was not lean.
I have used 8mm studs in Genuine VW and they worked OK to a point,
as long as the washers were thick and had lube on the thread and face of nut during tensioning.
westi ·
lol
vw54 ·
have you tried copper barrel spacers / gaskets there nice n soft and will bite into the barrel n head
Whats the engine case alloy with savers or a magnesium old type
matberry ·
Dave, how accurate is a flow bench at "calculating" hp?
westi ·
i quess it depends on the bench.
and how well everything is working together i guess.
my heads flow quite well ,i think so anyway.
my heads flowed 170 cfm @ 600' lift @ 10 inches of water and it did 198hp at 5850rpm,but i don't know the calc's for cfm to horsepower.
it would be interesting to see what you have to say on this one dave.get technical.i love technical.
matberry ·
Thanks Westi.
Get Tech Dave
My heads came back today,
flowed 104 cfm @ 10" / .600", but they calc should be good for 178.8hp
We shall see.
Main thing is, before valve job, was 96.3 cfm/168 hp.
dangerous ·
Mos people agree that the flow figure at 25"
CAN POSSIBLY make the same number in engine HP.
But this is all theory.
Most engines make less(mine heaps less), but some, particularly small port engines, can make more.
25 divided by 10 and sqaure root your answer
is the multiplier for converting 10" figures.
Mine flows 170 @10" at .650" lift(but keeps flowing right up to coil bind).
=268.8...I'm making 247, so perhaps with some optimising and tuning?
Matt 104= 164.4 engine power
As westi said it depends on the flow bench...still stumped as to why yours is not standard Westi,
but remembring it is a tool, you can use it to find real gains.
westi ·
stop calling me a tool
matberry ·
Swift y did the valve job and by the test data sheet, says 104cfm = 178.88hp.
I wonder if he has possibly optimised his bench with the number of race engines he's built.
Can only hope we can get somewhere close, this engine in Col's car ran a computed [1/8 mile/mph/wieght] hp of 135hp and going by swifty's figures of 141 hp @ .500"lift, before the valve job, seems pretty close.
Hell 178.88 hp from nonwelded 42x37.5 vw heads sounds fine by me, fingers crossed.😀