HP of a mildly modified 2L

[carl]

Years (decades?) ago I dynoed my 78 spider with 2L motor/1800 head/Crane ignition/40 IDFs. Dyno showed 94hp at the rear wheels so somewhere around 100 for the motor.

carl

[djape1977]

i've laid my hands on three heads today, one from tipo 1.6 dohc, one from croma 2 litre and one from tipo seidicivalvole. will let you know what works and what not as soon as i get 'round to disassembling them and taking some comparison and measures.
heads from regata 100s and ritmo 105 are getting rare and hard to find ones that haven't already been re-surfaced several times so i'm looking forward to finding a source for some new-ish heads

[djape1977]

by the way, didn't the regata 100s have reverse flow also?

[131]

by the way, didn't the regata 100s have reverse flow also?

Not in our part of the woods, the 100sie was reverse port though.

[fiatfactory]

.

[narfire]

Any head can be modified, it's a simple matter of fitting a larger valve seat

Excuse my ignorance(ex logger) but I take it the stock valve seat could not be machined to accommodate a/the larger valve.
Is it much of a job to replace the seats and are they a specialized item...?
Thx
Chris

[fiatfactory]

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[Kevin1]

The stock seats leave quite a bit of room for improvement. Opening up the throat to the point where the seating surface is at the outside (max) diameter of the valve makes a pretty big difference in the throat without having the cost of new oversized valves or installing larger diameter seats. It is a very good way, along with porting, to maximize what you have already.

If you are handy this can all be done at home for a few hundred dollars in tools. Two Neway seat cutters, an 8mm guide, a grinder and some burrs. And tools can be resold after you are finished to recoup some of the cost. I don't know any other way for tightwads to chase performance better than DIY.

[Daniel]

The stock seats leave quite a bit of room for improvement. Opening up the throat to the point where the seating surface is at the outside (max) diameter of the valve makes a pretty big difference in the throat without having the cost of new oversized valves or installing larger diameter seats. It is a very good way, along with porting, to maximize what you have already.

If you are handy this can all be done at home for a few hundred dollars in tools. Two Neway seat cutters, an 8mm guide, a grinder and some burrs. And tools can be resold after you are finished to recoup some of the cost. I don't know any other way for tightwads to chase performance better than DIY.

I know a better way,,,, they can buy a faster car or lose some weight. Ok this is besides the point I agree with steve on a couple of His views but the average Fiat 124 owner isn't interested in building a race car so if you only enlarge the seats not adding
bigger Cams, Intake system (Carb or FI), Exhaust, etc this is a waste of time. Besides you can remove 1 mm safely from the
inner throat of the Valve seats (I've done this before so I know it's possible) and still use the stock 42mm valves. So i hope this doesn't turn into a endless education on throat size now cheers

[BEEK]

kevin, the only problem with what you are talking about is if you do not handle the short side radius, you will kill the port no matter how big you make it, knowing where to enlarge and where to leave alone makes a big difference, i know this because i have spent many hours on a flow bench with fiat heads, when i had nothing else to do (used to port heads for a NASCAR / ARCA team) i have spent many hours with Keith Dorton, and Bill king. both very smart in the ways of cylinder heads. Not that i know what they do, but i did learn alot

[Kevin1]

"...the only problem with what you are talking about is if you do not handle the short side radius, you will kill the port".....
Agreed.
"...if you only enlarge the seats not adding bigger Cams, Intake system (Carb or FI), Exhaust, etc this is a waste of time"...
Again, agreed.
I assumed that if anyone was ready to dig into improving their cylinder head, the other items mentioned would naturally have to follow. It seems obvious that increasing flow would entail revisions from intake to exhaust, but maybe not to everyone, though. For the "cheapskates" though, a lot of the work mentioned can be done for the price of parts, and lots of elbow grease. In respect to the question about bigger valves on a budget, blueprinting what he already has is the best "bang for the buck" way to go abut it.

[PittsburghKevin]

Costs??? Well chasing performance and being a tightwad are incompatible goals.

SteveC

It's not like someone's suggesting building 500hp engine on a budget ...

Teasing aside, working on the Fiat is different. My uncle is working on a restoration of a Studebaker and is dropping a small block chevy into it. There isn't a question on how much it costs to get what performance target. I think most people are coming at it from that angle. What can I get for $500? $1,000? $2,000?

I'm still planning on what it will take to get the kappa engine fitted in the car and the main answer is -- a lot of shipping cost.

[fiatfactory]

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[Daniel]

Daniel, I'm not talking about building a race engine here... just talking about a 125/130 hp engine using the stock fuel injection manifolding and computer, which is WAAAAAY more fun to drive than the wheezy USA spec engine that finds it hard to get out of it's own way.

well that all depends on the owner some might think 125 at the wheels is WAAAAY more others maybe more like way or maybe just wa without the more part I personally think a Prius with a performance muffler will take your 124 with that setup

[Daniel]

hey Steve do you have A Abarth 131 Shifter extender the part that move the shifter back or any ideal where I can find 1?