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Old 02-11-2011   #31
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Re: 695 Engine Project

Have a look here - maybe he's just out of stock.

http://www.mrfiat.com/part.php?item=...SwitchNew.html

As to the alternator - it's not hard to wire up. I've attached a diagram.

The old voltage regulator is not required so I stripped the interior and reinstalled it on the rear firewall basically using it as a wire binding post.

Chris
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Old 02-11-2011   #32
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Re: 695 Engine Project

Thanks again. I'll see if mrfiat.com has that part number in stock (I realized when I emailed them I asked for a 126 starter and not a 125 so that might have been the problem) The wiring diagram should be very helpful and is greatly appreciated. I should be in good shape when the engine arrives.
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Old 07-11-2011   #33
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Re: 695 Engine Project

Quote Originally Posted by jcang0408 View Post
Thanks again. I'll see if mrfiat.com has that part number in stock (I realized when I emailed them I asked for a 126 starter and not a 125 so that might have been the problem) The wiring diagram should be very helpful and is greatly appreciated. I should be in good shape when the engine arrives.
Where you located? Where you getting the engine from?
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Old 07-11-2011   #34
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Re: 695 Engine Project

I second the last post as to where you are getting your motor from. I am about ready to buy a 650 motor from Mr.Fiat to pop in my 500 and was curious if that is where you are getting yours from. I will keep the Panda headed frankenmotor and tinker with it as a spare if I do.

If so, did you have to special order yours since you are getting gearbox and all?



As far as the one poster who Bambino mentioned a weber 30 to, I can say it is very tight with the Panda head and the weber30DGF I have. Mine even had a spacer between the carb an intake manifold making it even tighter than the picture Bambino posted.
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Old 07-11-2011   #35
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Re: 695 Engine Project

I found a source in Poland after much hunting around and considering mrfiat.com. You can email abarthparts@gmail.com and tell him what you need. He was able to sell me a complete brand new motor (same specs as mrfiat.com sport engine), gearbox, clutch, starter, carb, etc for substantially cheaper than mrfiat was able to do (I'd rather not disclose the exact amounts). I should have everything by the end of the month. I was a little nervous when he told me it would take about 30 days to recieve but I paid with paypal so if it doesn't show up, I still have 15 days to dispute with paypal. He seems legitimate though. I'll keep you posted. I asked if he carries other parts but he only deals with drivetrain. btw, if anyone is interested in purchasing my 500cc motor and/or gearbox, I'm looking to get rid of it once I get the new stuff.
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Old 06-03-2012   #36
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Re: 695 Engine Project

Hi Chris, I'm new to the forum, and having just purchased a 126 engine and fzd carb am looking to build a very similar engine to the one you have built here for my 500d. I assume you have now run the engine - sorry if I have missed other posts on this - and wondered if you had any comment on whether your choice of 35mm/29mm valve size combination "feels right"? Cheers Roger
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Old 18-03-2012   #37
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Re: 695 Engine Project

Hi Roger,

Sorry to respond so late but I've been away bushwalking (tramping, you'd call it) and have not had access to a computer or phone for a couple of weeks - good feeling really

The engine runs very well and is quite responsive - no doubt due to the valves, camshaft and slightly raised compression ratio.

If you are going to convert your 500D, you'll need to fit a 126 transmission as well because the bellhousings are different.

Let us know how you get on,

Chris
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Old 18-03-2012   #38
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Re: 695 Engine Project

Chris,

Could the setup you have be used in everyday traffic on a daily driver, or is it more suited to a car you'd just want to take out for a blast? Does the camshaft you've fitted need you rev the engine quite a bit?

Cheers,
Matt
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Old 19-03-2012   #39
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Re: 695 Engine Project

Matt,

The engine was designed as a daily driver, not as a racer. The cam profile is mild and the car idles well even when cold - I guess it's what could have happened if Fiat had developed it a bit more.

There are many more 'go faster' bits all the up to a fully blown Abarth motor tuned for racing.

I guess you'd call my engine a 'sports' model

Chris
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Old 19-03-2012   #40
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Re: 695 Engine Project

Thanks Chris, that's what I was hoping to hear. I'm thinking of building an engine similar to yours, but, like yourself, wanted a manageable, sporty setup for daily driving, rather than anything too racy.

Cheers,
Matt
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Old 25-03-2012   #41
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Hi there I about your conversion with interest. You must be very pleased with the results. I too have a 500 with a 650 engine and gearbox fitted by a previous owner assembeled with a sports cam and exhaust running the 123 electronic ignition, not sure of the spec of the camshaft though. I was particularly interested in you big valve cylinder head. My mechanic has my engine apart at the moment as itcwas leaking oil and needs new gaskets and piston rings as well as another few bits so I was wondering if it would be worth fitting larger valves at the same time. Is it an involved job and would it be of any advantage unless also having the head skimmed and flowed? If so would it maybe be better to concentrate in upgrading the carb instead, maybe to a 30mm as it's still running the standard weber 28 imb? With you experience I'd be interested in hearing you opinions. Obviously I'm not looking for wild gains but just something that might compliment the upgraded cam and exhaust. One last thing I was wondering was if the camshaft should have any stamps on it that would help identfy it's spec.

Thanks,

Colm.
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Old 25-03-2012   #42
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Re: 695 Engine Project

Colm,

The guys that fitted the large valves for me (I can't do this type of thing) and matched the inflow tract to take the 32/28 carby took one afternoon to complete the work.

The size of the exhaust valve is not so critical as the gas leaves under pressure during the exhaust stroke whereas a larger inlet valve permits better breathing and a larger volume of fuel/air mixture during the intake stroke which results in a bigger bang and more engine power.

If you have to, matching the carby throat with the inlet by widening the intake tract removes any steps that may interfere with the 'laminar' flow of mixture into the cylinder. It is probably not critical for a street car.

For a larger capacity engine the carby may become a limiting step in extracting optimal power for the state of tune and most people will fit something with at least a larger venturi though the 28 IMB fitted to the 650cc engine should be enough (the 500cc engine ran a 26 IMB). If you want to go to a 30mm choke, you'll need to fit a 30 DIC or something like that as the IMBs only go up to 28mm (I think).

FWIW, my advice would be to fit the larger valves and use the carby that you currently have.

As to the camshaft, it may be stamped or if not, it can be profiled at any auto tuning place. At the least what you need to know is the opening and closing angles in each cycle given a particular clearance and the lift (height of the lobe).

Talk to your local mechanic and get his advice and let us know how you get on.

Chris
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Old 25-03-2012   #43
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Chris, thanks so much for your advice. I don't really want to go wild as I'm running standard suspension and brakes and I know once you start tuning things can spiral and also reliability and drivability are more important than outright power. I just figured that as the engine was already apart it might be worth going the big valve route. I think your right the carb is something that can be tackled if needs be at a later stage. The decision then is just whether to stick with the standard 28 exhaust valves and go for 34 intake valves or maybe go 35 on the intake and 29 on the exhaust as you have done. Anyway I will take to my mechanic and see what he says. I'll let you know what transpires. Thanks again for the advice.

Cheers,

colm.
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Old 28-03-2012   #44
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Hi Chris,
on the subject of replacement valves I was wondering if you could answer a stupid question? While browsing sites I noticed, as well as the valve size; 33, 36 etc and what must be the length there is a measurement of 7 or 8mm which I'm presuming is the diameter of the valve stem. I had thought 8mm would be standard for the 650 engine but I see measurements of both 7 and 8 mm listed on various sites for both fiat 500 and 126. I was wondering what was the difference and which would be usable for a 650 engine.

Regards,

Colm.
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Old 28-03-2012   #45
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Re: 695 Engine Project

Colm,

The standard valves on a 650cc engine are 28mm (exhaust) and 33mm (intake) and both have 8mm stems and are also the same length (115mm).

I've attached a photo of the ones I pulled out of an old 650cc head to show the detail at the top of the valve stem as well.

Chris
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