does any one know how hard 2 put 1725 motor in to avenger

[1600GLS]

does any one know how hard 2 put 1725 motor in to avenger
i hav a 1725 motor out of hunter and was thinking of building a tuff wee motor for it
and myb run a 5speed

[blekkja]

Don't. Your 1600 is way better: the hunter is essentially just the same motor that they used in the SuperMinx. ie: It is old and shit. Avenger motor was designed new for the car and although they went with unexciting technology (OHV instead of newfangled OHC for instance) it is a top little unit because of it. They went with what was proven to work and to work well. And it does. It shouldn't be too much of a problem to get over the magical 100 horse barrier with a bit of enlarging, weight saving and a good set of Delortos. Somebody more knowledgeable than myself will tell you if your Chrysler GLS should have come out of the factory with the good TC motor and head - otherwise this is what you should be hunting down first. (Unless you want to go Japanese or American of course)

[avenga]

Why would you bother?

The hunter engine is rubbish compared to the Avenger engine. The 1600 Alpine is more powerful than the twin carb 1725 hunter engine. (82 Vs 80 HP on a testbed)

The hunter engine was carried on from the Humbers so it was probably designed in sometime in the 50's, it is old sloper technology Vs the Avenger engine which was a much better newly designed modern engine.

The Avenger engine can develop much more power when you tweak it also. They are totally different era engines and they don't really compare. Just because it is bigger displacement doesn't mean it is better. A lot of 2L engine make more power than my big 4.3L hemi 265 in my Charger.

Hillman Avenger GT 1600 twin carb 82HP (on a testbed at the flywheel, parasitic draining devices such as alternator or waterpump)

http://www.carfolio.com/specifications/models/car/?car=60555

Hillman Hunter GT 1725 twin carb 80HP (on a testbed at the flywheel, parasitic draining devices such as alternator or waterpump)

http://www.carfolio.com/specifications/models/car/?car=59961

[avenga]

It shouldn't be too much of a problem to get over the magical 100 horse barrier with a bit of enlarging, weight saving and a good set of Delortos.

My 1500 is putting out 78HP at the wheels which is over 100 at the flywheel or over 115 on a test bed like they used to test them.

[Nikolai]

[useless, informationless post]

SR20DE!

[JoKer]

90hp rwkw here using Richards Dellotto's

[1600GLS]

i have sum 40mm webers but they are 4 another project myb i will build a new head for it to get it to breath better

[avenga]

My race car was well over 100hp at the wheels. didn't get it dyno'd in it's final phase of development but we broke the 100HP at the wheels mark pretty early on in the development so I would guess in the final version of the engine it would have been around 120-130HP at the wheels.

Dynoing a car used to be so expensive so I get it dyno'd a few times early on then we did the rest by ear but we gain a heap more power out of it over the years of racing and developing it.

[avenga]

i have sum 40mm webers but they are 4 another project myb i will build a new head for it to get it to breath better

Use dellortos if you can. They are much better on an Avenger. The smaller fuel droplet size makes a huge difference.

I have some old magazine articles by David Vizard on how he built a 160HP Avenger engine back in the 70's. I will scan them sometime.

[blekkja]

I have a Delorto vs Weber comparison for Avengers in an old Magazine, and likewise.


If you have Webers they will be better than Stromys, but given that you will need to hunt down or manufacture a manifold you might as well go for broke to start with.

[avenga]

Yeah the manifold is the hard part to find. I found mine in Aussie.

[kierbear]

i agree with nikolai lol but i was told that hunter engines dont even really fir properly

[Nikolai]

Fitting most engine conversions costs the same, as the cost is in other things - rewiring, brake upgrades, diff upgrades, suspension etc which you have to do anyway if you're adding serious power.

The SR20DE fits in REALLY well, can convert to use the same original Hillman pedal box, you get the 5sp gearbox, plenty of room for mods down the track... Manifolds + Trumpets + Lumpy Cams + Turbos etc.. Even the exhausts line up near perfectly, no trans tunnel work required either. This is in a 74 four door Avenger.

You also get heaps of power (probably), mine still isn't running yet

[avenga]

I agree. The SR20DE conversion looks sweet. I am amazed how well everything fits, if I hadn't spent so much on my hot 1500 then I would be doing the same thing as Nikolai.

[kierbear]

yea but if you had to put it in yourself, which would be more of a pain to get put in? not all of us trust other people with our cars lol