My Fiat 2L TC engine spec

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Piotrek125p
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My Fiat 2L TC engine spec

Post by Piotrek125p » Sat Jan 16, 2016 9:10 pm

Hi.

GC, could You share with me a dyno chart for 2L Fiat TC engine with spec like mine or similary like mine ? For the record, mine engine spec:

-84.40mm bore
-about 10-10.2 CR
-0.06 bore-piston clearance
-intake port 36-35mm with 4mm SSR, everything by GC advise
-exhaust port ported like GC red book (33mm width, 1.5m. reduce from guide base)
-43.50 intake valve with 30 degree top cut
-36.00 exhaust valve, sodium cooled from Lancia Turbo without top cut
-30-45-70 degree on the seats, seats made from Trojan
-GC triple valve springs
-GC IIIA intake cam, IIB exhaust cam, timed 106/108
-straight shot or slighly offset intake manifold (M131 didn't fit in 125p), 2.75" lenght, with 2x DCOE 45 with 38 chockes (GC, please Your advise about the best chokes, main jet etc. for my engine)
-exhaust header, 4-1, 38mm inside diameter, 33-36 lenght, it will check on dyno and I will choose the best lenght
-6.2kg flywheel made from NOS OE 132 flywheel with Helix Organic Clutch

GC, if You have any comments due to my engine specs please leave Your comment. I am building a ultimate fast road engine for my 125p with 131/132 gearbox (big type), I want to have about a 170bhp and 200Nm, please leave Your comment whether it is possible to achieve such results with my spec ? What do You change to get this results ?

Sincerelery Piotr.
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cormac
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Re: My Fiat 2L TC engine spec

Post by cormac » Sun Jan 17, 2016 2:01 am

these specs are real close to what I expect to build...I will probably fabricate intake manifold myself but haven't decided whether straight or slight offset, GC has said that the slight offset has a positive effect on swirl - I hope I am remembering correctly and not misspeaking...I have a wild idea of fabricating intake out of one piece of billet aluminum...

I have my Weber DCOE 45's on my workbench awaiting a rebuild right now and an assortment of engine manifolds and blocks to choose from

and I hope to use a 131 transmission as well

I will do a 4-2-1 exhaust header 27" primary, 8" secondary or as close as I can get

as I am eliminating brake booster and moving master cylinder I will also fabricate an airbox with fresh air supply from inlets ducted from lower front of car

another difference is that i am anticipating doing is a hydraulic clutch release bearing though I know some say it is not what they would do...I will still do more research etc

and of course I am using this forum as a resource as well as Guy's books...and will use his new books as well
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Guy Croft
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Re: My Fiat 2L TC engine spec

Post by Guy Croft » Sun Jan 17, 2016 12:27 pm

inlet manifold offset, yes - I think it is probably a good thing for burn rate.

G
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Piotrek125p
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Re: My Fiat 2L TC engine spec

Post by Piotrek125p » Sun Jan 17, 2016 12:43 pm

And what about a rest of my spec ?
As to the manifold, his shape only depends what will be fit in the 125p, I want to do a straight but it could be impossible to fit.
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Re: My Fiat 2L TC engine spec

Post by Guy Croft » Sun Jan 17, 2016 12:48 pm

Hi Piotr

I was replying to Cormac's question, I will reply to your post when I have a good answer, but it's a good spec and I am impressed by the care you are taking to get it right.

I'd like to hear bout the life-support systems for the car - cooling, oil system, air intake, fuel system, instruments. 100% as important as the engine itself and often done badly..

G
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Piotrek125p
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Re: My Fiat 2L TC engine spec

Post by Piotrek125p » Sun Jan 17, 2016 12:58 pm

No problem GC, here we go with life-support systems and rest of the spec:
-in head thermostat (75 degree Celcius)
-modified coolant passages according to GC spec
-Mocal 16 row oil cooler
-Strada 130TC oil filter housing
-big wing wet sump made based on info from GC 2010 book and Youtube movie
-Selenia Racing 10W60 oil
-modified Argenta oil pump, 2mm spring washer, reshaped shaft, pickup unmodified (Argenta short-type)
-Magnetti Marelli AX801 in head distributor with 132 type electronic module (coil mounted on module)
-NGK B9EGV plugs
-OE FSO copper radiator with double fan
-50% Fiat Paraflu cooling fluid
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Re: My Fiat 2L TC engine spec

Post by Guy Croft » Sun Jan 17, 2016 1:02 pm

very good!

Fuel pump/regulator? Auxiliary fan for radiator and control system?

The small engine bay can cause real problems with dispersing heat from engine, exhaust, oil cooler and radiator.

What plans to improve under-hood and induction temperature?

I am not testing you - just offering guidance..

G
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Piotrek125p
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Re: My Fiat 2L TC engine spec

Post by Piotrek125p » Sun Jan 17, 2016 1:08 pm

Fuel pump-Facet Silver Top

Cooling fans with switch on the dashboard

VDO oil pressure, oil temperature gauges

About improve under-hood and induction temperature, yet I have not idea, I don't thinking about it yet but this is in plans, do You have some advices for me ? I will do of corse an air intake with heat protection to avoid to minimum a possibility of engine knocking.
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Re: My Fiat 2L TC engine spec

Post by Guy Croft » Sun Jan 17, 2016 1:16 pm

this?
Attachments
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Guy Croft, owner

Piotrek125p
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Re: My Fiat 2L TC engine spec

Post by Piotrek125p » Sun Jan 17, 2016 1:19 pm

Yes, I want to do something like this, it will be of corse slightly different that this Cortina intake system but very similar.
GC, in planns I have to use a thermal bandage for manifold for reduce a heat in engine bay, I think this is good idea, but what are You thinking about it ?
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Re: My Fiat 2L TC engine spec

Post by Guy Croft » Sun Jan 17, 2016 1:27 pm

thermal bandage, yes essential in that engine bay or the header will 'fry' everything

you should start planning bonnet vents and spoiler etc too...

If the underhood temperature is too high the cooler and rad just won't work...

G
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Piotrek125p
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Re: My Fiat 2L TC engine spec

Post by Piotrek125p » Sun Jan 17, 2016 1:32 pm

Ok, I will check what I can improve my engine bay for reducing a heat and share my ideas here.
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Will01
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Re: My Fiat 2L TC engine spec

Post by Will01 » Sun Jan 17, 2016 1:40 pm

As GC has already said you need a fuel pressure regulator for that facet pump to carbs.
Electric fan with thermostatic variable switch in top hose so you can tune it to that engine in that car
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Piotrek125p
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Re: My Fiat 2L TC engine spec

Post by Piotrek125p » Sun Jan 17, 2016 1:43 pm

Fuel pressure regulator of corse will be mounted for this engine, no doubt.
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Re: My Fiat 2L TC engine spec

Post by Guy Croft » Fri Feb 12, 2016 8:53 pm

spec is good, should easily meet your bhp/torque targets..

pay attention to:

1. Fuel octane - with (2) below you will need 97 or 98 Oct RON
2. Sealed ducted air intake, without this your engine WILL detonate and destroy your head gasket and pistons.
3. Ex system, you have not remarked on this - I know what to do and why..
4. Engine temp - 75 deg C max
5. Oil temp - 85 deg C max
6. Instruments - you need everything, TC engines are grenades... handle with EXTREME care ..
7. Fuel pressure - pump goes down (2) applies... mad pressure at carbs with engine off 4psi

etc etc etc etc....

it is a long list, Christ I should run an academy about all this stuff..

GC
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