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 Post subject: Re: most insane g13a engine
PostPosted: Wed Sep 24, 2008 2:59 pm 
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Location: brisbane
GT-15-HO wrote:
01swifty wrote:
timing is set at 35degre


:shock:

i find this really hard to believe and how do you even measure that? there is no 35 degree timing marks on the side of the engine!

just found out is LOCKED at 40degress engine is coming apart in the next few days so will take pics of the head (valves) for ppl


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 Post subject: Re: most insane g13a engine
PostPosted: Wed Sep 24, 2008 3:02 pm 
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Location: brisbane
what is the stock size of the valves? and do you just measure the surface? for a g13a


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 Post subject: Re: most insane g13a engine
PostPosted: Wed Sep 24, 2008 7:05 pm 
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01swifty wrote:
nice pics of the plane motors are they tuned for avgas? well the yourg fella found out tonight the motor needs a bottom end rebuild as it has huge crank pressure build up and startes runnin like sh*t till you take the oil cap off and it runs fine so we need a block asap


When the engines go out they cant be tuned until they go in a plane and have a prop attached to them , they are designed to use standard pump fuels. I generally run them up in the workshop before they leave so i know when the customer gets them they are a turnkey affair.

Its pretty exciting to have worked on some of these for what seems like an eternity and then starting them up and running them on a stand in the workshop.

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 Post subject: Re: most insane g13a engine
PostPosted: Wed Sep 24, 2008 7:19 pm 
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cool it would be fun doing those
did u young fella come pick his block up today?


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 Post subject: Re: most insane g13a engine
PostPosted: Wed Sep 24, 2008 9:15 pm 
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Location: Brisbane
yes he got a block.

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 Post subject: Re: most insane g13a engine
PostPosted: Sat Sep 27, 2008 10:38 pm 
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ext valves are 37mm and int are 30mm and the new block has just been bored out 1mm over size will post up pics of the valves/head tomorrow


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 Post subject: Re: most insane g13a engine
PostPosted: Thu Oct 02, 2008 8:40 pm 
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should have pics / video of another insane g13a early next week , another aircraft engine im building , this one has had a fair bit of custom s**t made to satisfy the customers requests to make it fit within the cowls of the nosecone of the plane.

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 Post subject: Re: most insane g13a engine
PostPosted: Thu Oct 02, 2008 9:54 pm 
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n0madic wrote:
should have pics / video of another insane g13a early next week , another aircraft engine im building , this one has had a fair bit of custom sh*t made to satisfy the customers requests to make it fit within the cowls of the nosecone of the plane.

Was going to ask you why they don't use the g13b, but just answered my question re making it all fit under the cowl.


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 Post subject: Re: most insane g13a engine
PostPosted: Thu Oct 02, 2008 10:21 pm 
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StinkyWizzleteats wrote:
n0madic wrote:
should have pics / video of another insane g13a early next week , another aircraft engine im building , this one has had a fair bit of custom sh*t made to satisfy the customers requests to make it fit within the cowls of the nosecone of the plane.

Was going to ask you why they don't use the g13b, but just answered my question re making it all fit under the cowl.


another reason is that we know the g13b makes most of its power between 3000 to 6000 rpm (peak at 5600 odd) , the aircraft guys only use max power on takeoff and then cruise when altitude is reached.

also the reduction drives we use are about 2.65 :1 and depending on the prop they select they have a maximum tip speed which also limits the rpm the engine is allowed to rev to , so 6000 rpm (where we make great power) is a tad too high for what their maximum prop tip speed
is (im no aircraft guru , im just regurgitating what ive been told )
the g13a makes its power at lower rpm and therefore its more beneficial for cruise in aircraft (its in its powerband , which i think is about 3500- 4200 odd rpm in the g13a which is where max prop speeds are achieved with the reduction drive with standard props)

i just build them to how the customer wants them , depending on weight and power requirements .

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 Post subject: Re: most insane g13a engine
PostPosted: Thu Oct 02, 2008 10:25 pm 
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From doing a bit of reading I see that the K10A N/A engines are also popular for similar reasons. Lightweight, peak power produced at around 6k. Of course the G13BA would be much easier to source in Aus.

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 Post subject: Re: most insane g13a engine
PostPosted: Thu Oct 02, 2008 10:53 pm 
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the k10's are only about in wagon r and theres not many of them about plus with the manifold config , we need something that is readily available so the g13a is the choice of engine .

also the shimmed buckets are a pain in the arse on the k10 .

the added benefits of the g13a is we use the gti crank and rods , we get the entire engine balanced , the current carby engine im doing is worth about $7500 (thats including the redrive which cost just under $3000). the turbo engine i did was $14000 , we use only the best s**t and it quickly adds up (our cost price was $9000 in parts and endless hours of labour) and thats not including the modifications (things made on the lathe or milling machine)

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 Post subject: Re: most insane g13a engine
PostPosted: Fri Oct 03, 2008 10:34 am 
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pics of the head and this car will be at the speedway this saturday night if you want to see the engine in person


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 Post subject: Re: most insane g13a engine
PostPosted: Mon Oct 06, 2008 7:18 pm 
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ok heres a few pics and a very short vid of the latest one up and running.

its a g13a coupled to a suzuki spg-2 reduction drive (the reduction drive alone is worth $3000)

it has a custom maruti alto manifold that has been turned upside down. mounted to the manifold is a bing aircraft carburettor

it uses a standard g13a distributor from the sa swift mounted on a modified housing . It uses the solid state coil from the sf swift.

the engine has been fully remanufactured (bored ,honed , new pistons , rings , reground crank (gti) , resized rods (gti) , bearings and seals , reco oil pump , lightened flywheel (from 5.9 to 2.8 kilo) reco cylinder head , all fully balanced internals , and all the other new stuff that comes in a reco engine)

the whole package as you see it (running in the video), before they even mount it into the aircraft and fit a cooling system is $7500 (the last turbo one i did was over $14000).

it uses the standard swift extractors coupled to a custom exhaust made for us by right price exhausts

heres a short vid of it up and running..

http://www.youtube.com/watch?v=i7TD7UCOk8M

heres some pics...


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 Post subject: Re: most insane g13a engine
PostPosted: Thu Dec 04, 2008 8:10 pm 
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Location: gold coast
ive heard car engine arent the best for planes because they arent designed to run at 75% all the time.. your on and off the accelerator, still work though. g13b's are awesome for it. so i guess 1's are just as good. bulletproof engines. only cause theres not many things that can go wrong with em =P

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 Post subject: Re: most insane g13a engine
PostPosted: Wed Sep 21, 2011 3:03 pm 
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unfortunately I missed this thread and love that it was created
the response and sound of that setup Dave is quite amazing from
a single Bing carb with upside down manifold.

Not familiar with the 8v heads is the speedway engine had
the chambers welded up? also what it theoretically the
largest valves that could fit this chamber?
It seems that 40mm inlets and 33mm exhaust could fit.


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 Post subject: Re: most insane g13a engine
PostPosted: Wed Sep 21, 2011 9:22 pm 
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I have seen and worked on some of these OFFENHAUSER g13a engines before and they are a very serious bit of kit AND YES the timing is set at 34 deg . The distributor is locked solid and using an adjustable timing light you can set the timing to 34deg static and it wont move. this works well with high comp and lots of fuel. There is a guy in America that has said he is making 190hp flywheel out of one of these engines. i am building one at the moment that will run 4 bike carbs that should go well.

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 Post subject: Re: most insane g13a engine
PostPosted: Wed Sep 21, 2011 9:51 pm 
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sounds awesome 190bhp from a 2 valver.
Any idea on valve sizes that engine has or yours is going to have?
Also you welding up the chambers for a wedge rather than hemi?


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 Post subject: Re: most insane g13a engine
PostPosted: Thu Sep 22, 2011 6:57 am 
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I am currently having custom stainless valves made and have been working with TIGHE CAMS to custom grind a cam for me . will let you know when its finnished and running .

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 Post subject: Re: most insane g13a engine
PostPosted: Thu Sep 22, 2011 12:33 pm 
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Any chance on leaking the valve sizes?

I would like to try 40mm inlets and 33mm exhaust
is it possible with an 8v vitara head and 76.5mm bores
if I notch the bore wall for the exhaust?


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 Post subject: Re: most insane g13a engine
PostPosted: Sun Sep 25, 2011 6:47 am 
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Be carefull going too big with the valve sizes as you could end up going backwards with the cyl head flow. Porting and valve sizes are criticle to get velocity too big on the valves and you can loose the velocity and just cause turbulance in the chambers.

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