Wanting a bit more power out of the 1.7.. options? Options

[Bill Meyer]

I'm new to the 914 world and coming from the 911 side the only thing I miss is the power. Otherwise, I actually prefer the new 914 to my Bahama Yellow 67 911S.

Anyway, it's a 73 1.7 that's been recently rebuilt, the only change being a Webcam and Hydraulic lifters, no idea of specs on the cam though.

What about a bigger bore kit on my 1.7. How big can you go on these cases, and will the FI and stock heads starve it for power? I'm not looking for a race motor, just something that scoots around nicely, say 100-125HP.

Whatever I do I absolutely want to retain Fuel injection. That being said, is my best option a later 2.0, and if so, how much reliable HP can be done with FI?

Thanks for any advice,
Bill

oh, and here's a pic of the new girl.

[stateofidleness]

that is a beautiful color!
no help from here on the topic at hand though.. sorry...

but nice car

[tracks914]

1.7's are for cruising. For power, real power it will cost you $5 - $10K.
A good 4 cylinder Raby engine will cost about $10K.
A six conversion will cost about $10K.
If you want power be prepared to spend.
If you only want about 100 - 110 hp, then it can be done cheaper.
Just my 2 cents. That's free!

[gregrobbins]

Nice car!

115-125 HP is realistic with a 2056. 2.0L crank, 96mm pistons, slightly hopped up cam (Raby 9550 suggested) and you can run the factory D-jet. I have a friend with a similar set up running 94mm pistons and he dynos 95 HP at the rear wheels, so should be around 110-115 at the flywheel.

You can use your 1.7L case, but it is advisable that you get 2.0L heads, or have your 1.7L heads modified to the 2.0L configuration.

[toon1]

Jake raby did a radio show on building a motor on a budget.

You can do a 100- 125hp for about 2k if you are savy.

with you 1.7 you have 90mm bores and a 66mm stroke crank and small valve heads.

A 2L is 94/71 with 3 intake stud heads, 039 castings.

About the only thing usable from your motor, for the HP you want, is the case.

You might be better off finding a 2L and rebuilding it.

That being said, Jake likes the 1.7 cases better than the 2.0 cases and build his high HP motors with them

There are plenty of options for a higher Hp motor and tons of info in the archives.

For a motor with 100-125hp the stock system will be hard to retain. It can be done but there are alot of adjustments needed to the MPS.

If you went with an aftermarket FI(megasquirt or SDS) system you will have FAR more tunability.

ALso my .02

[McMark]

Yup, 2056 is your reasonable limit for stock FI. Good power and lots of fun.

[Bill Meyer]

Thanks for the info!

Will my FI fit 2.0 heads, or for that matter an entire 2.0 motor, or am I better off finding a complete 2.0 FI system as well?

Also, just a thought here, but if I were to simply swap in some 96mm pistons and modify my heads a bit would that be a nice power bump? Should I look for higher compression over stock?

[Jake Raby]

The 96s that firt the standard 1.7 bore are very thin at the top and are known for huge cylinder/head sealing issues...

You can open the heads to the 105mm OD as the 1.8/2.0 heads had (up from 100mm) and then use the 1800 P/C kit with OK results.

But adding more bore without meeting that with coefficient changes in head and cam work will result in a lousy power band, thermal issues and not a well rounded combo..

How much do you have to spend?? I can stretch the dollar where it needs to be for you.

[toon1]

You just got a reply from the master himself

Follow his lead and you will skip merrily down engine bliss lane!

[johannes]

The cheap way (under 2000 $) is to unbolt the 1.7, to sell it, buy a used 2.0 and bolt it in ... ( for 85 - 95 hp)

Second way is to buy a 2056 kit from Jake Raby and spend a few week ends to rebuild your engine.
But you will be in the 4000 range + 1000 if you go carbs ( 105 - 125 hp )
And you will need the carbs to go 125 HP. And you will also need a new exaust because 1.7 and 2.0 are not the same ...

[Bill Meyer]

Haven't really set a budget or anything, just looking at the options first. Sounds like simply adding new pistons may not be the way to go.

[nein14]

Just Turbo Charge it (IMG:style_emoticons/default/smile.gif)

 turboengpic_JPG.htm ( 602bytes ) Number of downloads: 315

[So.Cal.914]

Haven't really set a budget or anything, just looking at the options first. Sounds like simply adding new pistons may not be the way to go.

No, a 1911 is not as exciting as a 2056. My first improvement to my 1.7 was to

build it to a 1911. Was it better? Absolutly. But not long after I finished the 1911, I

was buying a 2.0 crank and rods, a cam, P&C's (already had carbs & dizzy). If

you can wait and save your money, I think you will be happier with a 2056. You

can get the parts from distributors, and save a little. But I have been very

impressed by Raby's dedication to R&D and to his customer base. Just my .02

[johannes]

In the Raby Kit you have 2 new special heads, flyweel, pistons, cylinders, crank ...

[Joe Ricard]

Just put a 1911cc in my car as an interim. H grind cam and 2.0L heads. Tangerine and 40 IDF's so far I can tell you it's not as strong as my old 2.0L was.

Torque makes the world go around a lot quicker.

I'm going to fuss around with the jetting some more but WOT is right around 12.5:1 So I don't see it getting much better.

[Jake Raby]

The engine kit is an unassembled engine... More than just a box of parts because everything is balanced, indexed, clearanced and ready to assemble..

Wednesday will be the final day of the 2007 engine kit Program, we'll be freezing sales until December 1 when the new combos are released, prices changed and upgrades are made..

Remember:
Adding larger pistons also requires a coefficient change with heads, cam and etc unles you want to create a misconfiguration..

Misconfigurations ARE the reason why the TIV never blossomed until my efforts were carried out..

[Joe Ricard]

Are my heads in the mail yet?

[orthobiz]

Since Jack, Joe and others are weighing in on this thread, I'd like to ask the question:

Just how much HP can one extract out of this engine by going to the 1911. I have a 1974 1.8, have a very original car and would like to keep the original engine, original FI and (eventually) rebuild it to be as stock-looking as possible. i.e., no carbs, no megasquirt, etc.

My car is very fun to drive, but the 76 horses leave a little to be desired...Thanks

Paul

[Jake Raby]

Are my heads in the mail yet?

Yep, on the way to Len...

The 1911 is a fine combo that accelerates quickly with the right cam and heads and can be a lot of fun.. For the cost going to the 2056 gives much more return on the investment. I have a 140HP 2056 combo- if you have carbs.. (you will be stuck @ 110 HP with stock FI)

[914werke]

Ok Ill chime in, The 1.7 in good tune is a zippy little motor but does lack the grunt. I built a 1911 and is currently in my Sunflower yeller 73.
Its got 2.0 heads and exhaust as well as 2.0 induction and FI off a 74.
Never knew what the cam was but its pretty danm strong. (IMG:style_emoticons/default/w00t.gif)
The Stock 2.0 does have torque on it though, and the McMark/Raby 2056 with ceramics sitting on my bench will prolly kick its pants (IMG:style_emoticons/default/laugh.gif)
That is if I dont sell it to pay for this coming holiday season (IMG:style_emoticons/default/sad.gif)

Bill you should call me (IMG:style_emoticons/default/idea.gif)