2443cc turbo EFI build

[AntLockyer]

Hi all, I've got a 88mm cranked motor here that I'm going to rebuild to be a bit more street than it already is. Right now it's got Superflo IIs, FK89 and big IDAs.

Its going in a 67 bug and the brief is it needs to be able to drive to shows around the UK and Europe in 'relative' comfort.

Obviously as I'm posting in the forced induction forum I'm toying with the idea of using a turbo. Now my questions are related to compression and cam choice. Obviously with an 88mm crank compression is always up there. Using something like an 044 super mag with a 67cc chamber gives a 9.2 static.

So I'm guessing with that static I'm going to need a fairly serious duration cam to get it down low enough, but that's where my knowledge ends really. I suspect I'm going to be asked what sort of boost I'd like to be running and again open to suggestion. The simple answer is 'enough'. I want the thing to last well enough and not burn up on long motorway runs but obviously it needs to be enough to be worthwhile turboing it in the first place rather than sticking with my IDAs

Thoughts?

Thanks

[The Newf]

You want to get your CR down to around 8 or so.FK89 is a little long in duration for turbo street use.FK8 works well for me on a smaller engine than yours (2234).I would think the heads will work,but smaller ports might up the velocity & get your boost where you want it.

[Stripped66]

I'm not a fan of turbocharging large-stroke cranks. If it has Type 1 main journals, I would sell the crank and find something smaller with at least a 411 center main. Just my $0.02.

[AntLockyer]

It has type 4 mains. The Newf are you saying I should be trying to get dynamic CR to 8, seems high from what I've read.

[The Newf]

Static was my reference.I run 8:1 static with an fk8 & 1.4's.I have my wastegate set to 24 psi,street use.Have run higher at the track...much higher,although I'm NOT encouraging anyone to do so.Mine is a type 1.I also use meth/water injection starting at 1 bar.
I think what most people don't stop to consider is the amount of time you keep a 300 plus hp bug at high boost...you just can't on the street.You will be breaking every highway traffic act known to man.By the time my car see 24 psi,I've already been a very bad boy.

[AntLockyer]

OK that is a useful reference point thanks. Is your combo 92x84mm? What rod length?

I have to buy heads, my superflos have 59cc chambers IIRC and the 044s I have which are superb small port heads have something really small like 49!

The sale of the superflos and Jaycee carbs should pay for most of the rest of the setup is the plan.

[AntLockyer]

Assuming a bunch of stuff like a 5.4" rod I have your DCR at 5.8:1

[The Newf]

Yes:92 thick walled 84 stroke.I Can't remember if I used a 5.6 or 5.7 rod, but I think it was a 5.6 to keep the motor narrow as possible.I built it many motors ago.lol

[AntLockyer]

Thanks. Oddly it looks like the fk8 gives a lower DCR than the fk89. Having 5.8 with 24 psi as a ballpark figure is really great info so thanks. Lots of pouring over cam specs for me to see if I can get in that ballpark or if I should just chuck some injection on there instead.

[AntLockyer]

Changed the thread title rather than start a new one.

Starting point is a 2443cc (94x88) engine that I bought many many years ago (in the 90s maybe). It used to power a dragster in the VWDRC. Rimco machine case, type 4 centre mains, flanged crank, super flos IIs, 52mm IDAs, FK89, Vertex mag, Autocraft rockers etc.

The plan is to use as much as possible of the motor as really it isn't much use to anyone other than as a curiosity of days gone by.

The goal is to install this in my 1967 bug which has a full cage that also ties into the frame horns. I had the cage installed about 10 years ago and have done nothing since other than let the floors get rusty. That's a whole nuther thread.

The goal for the car is to have something I can drive decent distances (our new house is 170 miles from any drag strips), travel to foreign VW events (Spa is 230 miles), cruise the sea front and have something to mess about with in general.

When the cage was added large parts of the rear floor and parcel area were cut away, I will use this space if needed for placement of the induction system.

I'll be selling off the heads, carbs and magneto and putting the money into new heads (thinking Super Mag CNC Round Ports) and the rest of the bits I need. I'm thinking as packaging isn't such a big deal I might be able to simplify (and save money) by running a single throttle body. I'm also going to be looking for a secondhand OEM turbo to fit my needs.

First step then once I've moved house (and get my own workshop) will be to tear the motor down and see what is up. If the pistons look good I'll stay with them which will give me almost 9:1 CR if not I'll think about getting the dished ones to drop the CR a little.

I'll try and be thorough and post lots of pictures.

[AntLockyer]

Going to make a to do list and a decisions list. Once things are on the decision list they are fixed unless someone comes up with a very good reason for me to change. I'm a big mind changer which messes long term projects up no end (and wastes thousands).

To do
Buy Engine stand
Strip engine
Buy cam
Buy Barrels
Buy heads
Buy other replacement parts depending on condition
Sell super flos
sell IDAs
Sell Magneto
re-assemble motor
Buy/build exhaust
buy build induction side
buy/build ECU
buy throttle body
buy injectors
buy turbo
buy intercooler
buy fuel pump and filter
Buy tinware
Buy alternator and stand

Decisions list
Use an intercooler from the outset
Heads need 67cc (give or take a cc) chambers
Not using original oil cooler, external only
30 horse doghouse shroud
MegaSquirt-II PCBv3.0

[woodsbuggy1]

Many of the things on your list can be found and the wreckers(junkyards here in the states) hopefully you have a friend or 2 with the ability to machine things and you can modify or make many parts. I would plan on more compression and low boost (8 or so lbs) and have a motor that makes lots of torque at low RPMs and really wakes up when you hit boost. I am not an expert by any means, just know what I want from my next motor.
Good Luck
Kenric

[Chip Birks]

Or put in a set of c height squishies, run 9.5 to 1 and all the boost you want

[AntLockyer]

The junkyard/ebay approach is definitely favourite. I'm interested in the idea of Squishies though. Might even be able to run the superflo heads and keep my autocraft barrels in that case. Working out what cam is the only issue, I need to do a lot of research.

We are moving house next Thursday so this will be underway soon.