TheSamba.com :: View topic - How Much Power Can a 1600 Dual Port Make? We’re Finding Out!

Thu Dec 19, 2024 3:22 pm

NJ John wrote: 14:1 CR and everything else stock!

Can’t wait, actually. I stream a lot of content everyday, and most VW related videos are short. I don’t like to stop what I’m doing to find another video.

LOL, but it does hint at something on my wish list…

Take a stock engine and set it up to run on E85. At first try just the external mods, but then bump the compression ratio to take advantage of E85. I’d run E85 except for the limited availability in western WA.

Thu Dec 19, 2024 4:55 pm

Rome wrote: Quote: Without splitting the case apart at all
Will you remove the original heads and rework them with 3-angle valve jobs, maybe bore for 88 mm cylinders that fit into the stock case opening; and flycutting them to raise the compression ratio slightly? And per Glenn, adding 1.4:1 rocker arms?

Or will you install larger-valve new heads and keep the 85.5 mm pistons/cylinders?

I'm looking forward to your progress and updates.

All of that has been talked about. Eventually we'll get to it all!

Thu Dec 19, 2024 4:57 pm

mikedjames wrote: Generate enough horsepower to melt pistons in a 1600 DP bus on a hill?

The way we're heading, that may eventually happen. :D

Thu Dec 19, 2024 4:58 pm

oprn wrote: halfassleatherworks wrote: Make up headers for a Tri Y 1 3, 2 4 vs 4 into 1
Yes please! If we were closer I would lend you mine in a heart beat to try out!

I wish you lived closer too. This is the kind of stuff we're wanting to try out!

Thu Dec 19, 2024 9:03 pm

Interested to see 8-8.5:1 on 91, colder plugs to match, reduced timing to match, and 91 octane on an otherwise stock engine.

Fri Dec 20, 2024 2:44 am

Not quite just the CR raise. But,
Fully balanced, 0,043" deck, cleaned bowls, competition valve and seat job, 8,1 CR, 1,25/1,1 rockers, 27 mm venturi in the stock 34 Solex, Nos Ernst muffler.

I vaguely remember to have had some customer engines on the rolls with just a raised CR to the same 8,1-8,3. They hovered around 55 hp & 115ish Nm torque.
8,5 is pushing it on 91 (95 euro) - even with colder plugs and optimised timing, because at some point the burn is not completed before the piston is too far down the cylinder, so power diminishes.
One way to get around that if you are chasing boundraries is to increase the spark strength so you get a faster initial flame propagandation. Then you can take advantage of the higher CR. But the difference will be minor.

Fri Dec 20, 2024 4:19 am

NJ John wrote: 14:1 CR and everything else stock!

On alcohol! With an S&S "alcohol" carb meant for a Harley! :lol:

Come to think of it there's a seldom seen (in the U.S.) there's a high compression Brazilian VW motor with brass bodied dual carbs. It's an alcohol motor straight from the factory.

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Fri Dec 20, 2024 6:30 am

One thing I would like to see is the engine run on different octanes without any internal changes to put to rest the various old wives tales! Some real hard data for a change!

Fri Dec 20, 2024 7:59 am

If the energy level is the same in the respective fuels you will not see any noticeable difference. But usually is is so, that the higher the octane the less ethanol content there is. And that can actually make a difference due to, - the energy level

Fri Dec 20, 2024 8:45 am

[quote="EVfun"] NJ John wrote: I’d run E85 except for the limited availability in western WA.

Same here in large parts of the US, and not to mention the huge variation of alcohol content of said fuel. Too many people take the labeling on the pump at
it's word and trust that it is what's labeled. They pay for it with a blown/damaged motor.

Fri Dec 20, 2024 9:37 am

This thread is straying quite a bit already, as it often happens. BUT, I hear you on the energy level of your fuels, normal or E85. As I see it you basicly have the power to do something about that.
While it of cours is not for everyone, there are significant enthusiasts around who has the funds to purchase a unit like this so they can - pretty accurately see what the particular company sell you:
https://www.amazon.com/Oktis-Portable-Analyzer-Gasoline-Control/dp/B09MLMT1T7
https://shatox.com/catalog/i-4-octanetester.html
https://zeltex.com/index.php/fuel-octane-analyzers/
If you team up and begin to publicice which companies do a good job and which don´t, and then simply boycott the poorer subjects, I´m sure you can soon make an impact on their sales numbers, enough for them to start taking their products seriusly.
I am aware that in lesser dense populated areas there may be, or will be lesser alternatives, but still, YOU have the power to do something about it if you put your mind into it.

Fri Dec 20, 2024 1:46 pm

ps2375 wrote: EVfun wrote: I’d run E85 except for the limited availability in western WA.

Same here in large parts of the US, and not to mention the huge variation of alcohol content of said fuel. Too many people take the labeling on the pump at
it's word and trust that it is what's labeled. They pay for it with a blown/damaged motor.
A quick look at the specs shows the allowable range for E85 is 51% to 83% ethanol. That is a huge range! It looks like most areas with milder winters generally run between 70% and 83% ethanol seasonally (volatility classes 1-3). If one could insure it would stay in that window I'd think a pretty good all-around tune could be found. E10 changes the A/F ratio from about 14.7:1 to 14.1:1. E85 ranging from 70% to 83% changes the A/F ratio from around 10.7:1 to 10:1. The cold winter blend (class 4) would move the A/F ratio way out to 11.8:1.

It looks like the current standards may make testing with E85 impractical for a carbureted engine.

Fri Dec 20, 2024 2:37 pm

OK. Thats a huge difference in concentration I admit.
A quick search did not show it, but in Europe the tolerance is waay narrower. I believe something like 5% variation.

Sun Dec 29, 2024 5:56 am

I'm just going to leave this here......

Sun Dec 29, 2024 6:36 am

Ah yes! The poor man's supercharger! :lol:

Sun Dec 29, 2024 6:41 am

Fun With VDubs wrote: I'm just going to leave this here......

Rookie move.

Sun Dec 29, 2024 8:32 am

^^^This!^^^

A proper setup with dual hoses... and a pop off valve! :wink:

Come on Fun With VDubs, do it right or not at all! :D

Sun Dec 29, 2024 9:35 am

oprn wrote: ^^^This!^^^

A proper setup with dual hoses... and a pop off valve! :wink:

Come on Fun With VDubs, do it right or not at all! :D

We don't have the time to do anything right! Nor the budget! :lol:

Sun Dec 29, 2024 10:36 am

Fun With VDubs wrote: oprn wrote: ^^^This!^^^

A proper setup with dual hoses... and a pop off valve! :wink:

Come on Fun With VDubs, do it right or not at all! :D

We don't have the time to do anything right! Nor the budget! :lol:

Now thats the kinda shit that’s interesting.

Mon Dec 30, 2024 6:53 am

Fun With VDubs wrote: oprn wrote: ^^^This!^^^

A proper setup with dual hoses... and a pop off valve! :wink:

Come on Fun With VDubs, do it right or not at all! :D

We don't have the time to do anything right! Nor the budget! :lol:
All good! I was just yanking your chain! There is no way on God's green earth that setup is going to make enough pressure to require a pop off valve.

Carry on.