John Martin
Well-Known Member
So, where's the question ?
It was lost in the last thread, but I was asking about the AussieSpeed Evil Stick.
So, where's the question ?
From what I got, you want to build an economical slant that is reliable, and can be driven everyday. The slant in "stock form" is already just that. Shaving the head/block, building a cylinder head, fancy stall converter, gears, etc etc would not be economical. Sounds like you've been on .org ?
I would suggest a stock rebuild of the motor, electronic ignition, and a free flowing exhaust. Economical, reliable, daily driver. Done.
i would be careful with the comp cams in a slantie, they have a bad reputation for chewing up camshaft gears
From what I got, you want to build an economical slant that is reliable, and can be driven everyday. The slant in "stock form" is already just that. Shaving the head/block, building a cylinder head, fancy stall converter, gears, etc etc would not be economical. Sounds like you've been on .org ?
I would suggest a stock rebuild of the motor, electronic ignition, and a free flowing exhaust. Economical, reliable, daily driver. Done.
Improving on the design is absolutely economical. There is horsepower on the table with a slant six, it just needs help opening up.
I guess you didn’t see the part where I am looking to get back power from the accessories the engine will have bolted to it.
Beautiful!!Getting it in and out. That's what it's all about. Super six carburetor, or small four barrel, mild camshaft, headers or modded opened up exhaust and bigger exhaust pipe. Milled head and or block for more compression. It's like any other engine, really with the exception that if you only do one thing, they payoff is much, much less, simply because you're working with less in comparison to a V8. Less bore size. Less bore numbers. Less cylinder head all the way around. Less port volume. Less valve sizes. Depending on how far you want to go, you can have the head ported and larger valves installed. That's getting pretty costly, but will add even more. Even an air cleaner designed to straighten and smooth the incoming air can make a difference. All of these things together will make a pretty big difference with a slant six.
It's entirely possible with smart modifications, to add a solid 100 horse power from the stock highest rating of 145 and remain fairly streetable. Difficult naturally aspirated, but not impossible. Here is the latest cylinder head I am working on I just recently got back from my head porter. Completely ported, polished and modified for 318 valves. He was able to get from 99 CFM on the exhaust to over 150.That's an improvement I'll really be able to feel. As I said, it's costly. You just have to decide "how far" you want to go.
View attachment 1715719873 View attachment 1715719874 View attachment 1715719875
Here is the manifold mod I spoke of. I suck at using a grinder. I have lots of respect for those who can. My friend Freddie who lives five minutes away is one of those people. This thread outlines what he did to the manifold I have on Vixen now. He's done a second one I have on the engine in the picture. He got the outlet on it up to 2.5". I never would have imagined there was enough meat there to do it, but there is. I am going to get him to do another one for an engine I am building for a member here and probably a couple more for me just to have, since I have several more. It's a combination of small things like this that will add up and make your slant six a lot of fun. Here is the thread.
Exhaust Manifold Mod
I have extended the olive branch and continued to offer help to you. It's up to you how you react, not me.[/Q
Improving on the design is absolutely economical. There is horsepower on the table with a slant six, it just needs help opening up.
I guess you didn’t see the part where I am looking to get back power from the accessories the engine will have bolted to it.
The slant is really under rated in my opinion. With the long stroke, it can be a great street engine. Back in the early 60's, the hyper pack really was a head turner!
Improving on the design is absolutely economical. There is horsepower on the table with a slant six, it just needs help opening up.
I guess you didn’t see the part where I am looking to get back power from the accessories the engine will have bolted to it.
Improving on the design is absolutely economical. There is horsepower on the table with a slant six, it just needs help opening up.
I guess you didn’t see the part where I am looking to get back power from the accessories the engine will have bolted to it.
I guess I'm not sure what you mean by economical ?
Are you talking economical as in money or fuel economy ?
I was thinking economical as in money. Building one of these engines for power adds up real quick.
Yes it does. Ask me how I know. lol It's a lot of fun, though.
That is one of the prettiest things I've ever seen
John, 3.23 gears are my favorite for all around driving too. If you maintain the stock tire size, you will be winding that guy up pretty high at 80mph with 3.23's. Slant sixes don't like to be revved up high because of the long stroke. The engine will last longer if you keep the R's on the lower side too.I guess that when I said I want to build an economy slant six it was pretty unclear huh?
I am looking to increase the power of the engine to make up for the fact that it will be driving an A/C compressor, and a power steering pump, in addition to the water pump and alternator. I estimate that the car would only have around 90 net hp at the crankshaft with all the stuff on the engine and installed. I would like to have about 160 net hp more or less with everything on the engine.
I know I can get some free horsepower back with improvements to a stock 225. I have had two Darts with 225s and 2.76 rears. They are dogs around town, and shine on the highway.
The car will be going to Florida when I have finished with it. It will need to go 70-80 mph consistently. 3.23 gears are a good compromise between the 2.76 highway gears and a 3.55 acceleration gear.
:yawn:economy slant six it was pretty unclear huh?