Another super stockish build

[BFB]

What never gets asked is why the big boys running boost run hemi chambers… no one here wants to look into that for fear they might be wrong about something.
I’d say the hemi heads are trash if you use them like st. Berg suggests with 7:1 cr then all the common knowledge about it thats spewed out here probably does apply. Unless st. Berg was here to tell everyone why it was a good idea, then theyd all get back on the bandwagon.

The chambers im talking about though, put those to shame… interesting thing id read about this type of chamber is that it works great for eliminating pre-ignition because theres no edges and hot spots like a traditional chamber with “squish”.

Far as these heads though, with that chamber id run more compression than 8.4 and i sure wouldnt run Cerekote, thats stuff is garbage, at least the non bake ceramic coating is. Maybe the bake on stuff is better, i dunno. Not interested in finding out.
_________________
"how am i supposed to torque the rear wheel nut to 250 ft lbs??? " - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
Most experts aren't.

[Alstrup]

Show me ONE high ranking ACVW turbo engine that has SH heads

A few turbo/nitrous engines run 4 degrees tilted squish opposite the plug. Thats not hemi.
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https://www.thesamba.com/vw/forum/viewtopic.php?t=435993

[Brian_e]

[BFB]

did I say it was VW specific? no, but I like how you try to load your question as it narrows down the scope of it so that your weighing it heavier on your side to try to prove your point. THEN you'll say something stupid like vw is a different engine than say an LS or any other internal combustion 4 cycle engine just to again, try to prove your right.
also, your holding onto the st. Berg term of "SH" , and trying to cover your ass with what's not a "SH" head too....
you need to calm down, the fuck you getting so worked up about and so adamant you have to be right for? you doing shit like this is why certain subjects dont get discussed and why matthewl made the disclaimer in his initial post about how much hate there is. he already knew there'd be some dipshit sidetracking things because they think they know everything, yet he still wanted to post what he's got going on inspite of there being a YOU thats going to start shit about it.
if you dont like it, thats fine, but how about you be an adult, shut your mouth and let ol boy have his day without you pissing all over it.

but to answer your question, I have seen a set of of Pauter heads with hemispherical chambers. ( not SH ).

now, I couldn't give a shit less what you all think nor is it my job to prove your wrong. I dont care, im not like you and dont think everyone has to bow down to my superior knowledge nor do I think ppl need to agree with me, thats childish. nor do I see any of you doing something so amazing that you need to be recognized as being an authority on the subject. pretty sure you, Alstrup was the same one that one telling someone they had pre-detotanion?? personally I think ya'll look stupid because you fell right into the hater category that Matthewl mentioned. nice job.
_________________
"how am i supposed to torque the rear wheel nut to 250 ft lbs??? " - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
Most experts aren't.

[Brian_e]

I never said a bad thing about the SH chambers, I was just answering your question as to WHY its done in the VW world.

No need to hate anything here. I have a really good idea what the outcome of his engine will be regardless of what the chamber shape is. Some chamber shapes will make it slightly better, and some will make it worse.

Brian
_________________
So more or less the lazier and stupider you want to be, the nicer quality parts you need to buy.
-Modok

Narrowed beams, Drop adjustable spring plates, Bus disk brake and IRS kits.
www.type-emotorsports.com

Type E Engine Parts and Supplies
https://type-emotorsports.com/collections/engine-parts

[AlteWagen]

Werent most of the real 'hemi' heads used with domed pistons? I thought that is why they needed 40+ timing when used on a VW because of the flat top piston. With the dome and the hemi shape chamber deck height was not such a big issue since the flame only had so much area to travel.

If a domed piston was available for A/C VW you could realize the benefits of a 'SH' chamber. The issue now is the low compression the SH chamber gives for NA builds with the different timing curve most dont use so the engine runs hot. with the inefficient combustion comes, lower mpg, more heat, less engine life especially when people throw more fuel at the issue. If the stock bathtub chamber design required 40* timing from the factory why would an even bigger chamber shape require any less?
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Grapes of Wrath $200 Engine Rebuild
Official Dual Carb Thread
Cylinder Head Quick Reference Sheet

[Brian_e]

Correct. Real Hemi heads also have canted valves, which makes the airflow substantially better as the valve lifts higher. The ONLY benefit running a hemi chamber in a VW is to make a huge chamber volume. If you have a need for a giant chamber, or you like catchy phrases or titles, a VW Semi-Hemi might just be perfect for you!!. Again.....not hating on them, just explaining the differences.

Brian
_________________
So more or less the lazier and stupider you want to be, the nicer quality parts you need to buy.
-Modok

Narrowed beams, Drop adjustable spring plates, Bus disk brake and IRS kits.
www.type-emotorsports.com

Type E Engine Parts and Supplies
https://type-emotorsports.com/collections/engine-parts

[Wreck]

Just thinking of Nascar , most likely the most developed parallel 2 valve engines on the planet . If they thought a SH chamber and domed piston was good it would have made it there .

Instead you have the opposite , dished pistons ,shaped to the chamber. A small chamber shaped to continue the port profile .With as big a quench area as possible.

I have a set of dyno run pistons bought off ebay from a Nascar team . They run a very very tight squish , you can see on the pistons where they have just been touching the head .

Steve Morris has a YT clip on squish . With boosted engines they soften the squish pads by milling them at an angle . about 7 degrees from memory .

If you look at simple physics , you wants as much thrust from the combustion event parallel to the rod , not at 30 or 40 degrees to the rods .for example at 45 degrees you loose 50 percent of down thrust to side thrust .

Merry Christmas from Australia !

[Brian_e]

This thread went from discussing an engine that will struggle to rev to 4250rpm, to discussing a historically bad chamber design, all tied together by BFB once again yelling profanities at someone.

Brian
_________________
So more or less the lazier and stupider you want to be, the nicer quality parts you need to buy.
-Modok

Narrowed beams, Drop adjustable spring plates, Bus disk brake and IRS kits.
www.type-emotorsports.com

Type E Engine Parts and Supplies
https://type-emotorsports.com/collections/engine-parts

[BS&E]

I went 1914 with PICT 34 in my Thing
It drives like a modern turbo diesel . Pulls like a tractor and run out of steam at 3900rpm .
And I love it because it is a cruiser and simple to maintain
It can idle al day long , cruise with a trailer at 90-100kmh and topspeed around 150kmh
Never get higher in oiltemp than 110 celcius
Looks bone stock with original oilbath filter , and og heater boxes , but with a simple 1 3/8 4-1 header . Rest of tthe exhaust system is made out of 2 HideAway silencer that comes out through the bumper as original
It is VERY "snappy" engine(has cracked one flywheel at the center) , and at meetings , everybody look in my enginebay , and looks very confuesed
The numbers are 86hp/3800rpm and 170nm /1800rpm
@Alstrup

[Rob Combs]

Now that we’ve steered back towards the original post/topic, can you share more about the cam & heads on the 1914?

Might shed some light on where a similar configuration would max out on a ~ 25% larger displacement. Brian’s initial 4k estimate looks like it might turn out to be on the high side all other things being equal.

Torben once indicated to me that, whether out here in the open or perhaps via PM when I was still penciling in my own setup, that the sweet spot on stock-looking performance engines comes in at 1955cc. Edit: using some of the tricks he’s got up his sleeve.

After doing a lot of homework since then, and making a couple mistakes of my own, it’s starting to make more sense, at least to me it is.

Merry Christmas everyone!

[BFB]

[sled]

[Alstrup]

[Brian_e]

[BFB]

Alstrup, I bet you have an idea where id tell you to put your hints. and I say that because your not actually discussing anything, just trying to set up questions so the answers set you up to be right and you throw out shit to try to make yourself look smart , when your really not, at least not as much as you think.
I think its unfortunate that people that dont know better follow your "advise" like its gospel... hey, I think I'll call you st. Alstrup from now on! not that your in the same category as st. Berg, he actually accomplished a lot.
and if you dont want to have a "pissing match" then dont address me personally, definitely dont talk to me in a condescending manner because we all know I won't just let that go. but instead, just make your point and move on. and if someone contradicts you, its ok, it doesn't demote your sainthood, so you dont have to defend yourself nor try to prove the other person wrong.
but the real important part here, the main thing your overlooking or ignoring/ diverting attention from is the fact that YOU are the guy hating on ol boys heads that he predicted someone would do. you started all this shit. at least Brian said he wasn't trying to hate on it, just wanted to make a point. completely understandable. you st. Alstrup were on the other hand being a snarky ass and still following the same pattern...
_________________
"how am i supposed to torque the rear wheel nut to 250 ft lbs??? " - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
Most experts aren't.