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engine mod's for 1.7 boxer

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7.4K views 15 replies 3 participants last post by  Toad  
#1 ·
What can i do to get some extra power under the bonnet of my 146.

I am thinking about cat bypass + chip + back box & K&N pannel filter

or ripping out the injection and replacing it with carbs +filter and exhaust.

Or could i fit a 2l boxer/TS engine in it.

And finially does anyone know who can do any of these mods for me. As i have used Alfatech Racing in Luton and i am not going back
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Cheers
Phil
 
#2 ·
we run a 146 1.7 aswell no mods though.
I was thinking of replacing my 1.6 boxer for a 1.7 & fitting carbs, I'll find the advice I was given.
OK, lets have a quick look at what you can do with a 16v to get it to be a clockwork engine rather than an electronic one.

Firstly, the distributor - If you take a look at a distributorless 16v engine, the chances are that you'll see a little plate where the distributor would normally fit. Pull it out, and you can put in a distributor, though possibly you may have to fit an earlier oil pump with a suitable distributor drive. A new oil pump is a good insurance policy anyway in my opinion. You will also probably have to drill and tap a hole for the distributor clamp bolt, but that is into an alloy casing, easy to do.

This will allow the fit of any of the boxer dizzy's, but bear in mind that the advance curve of non -16v dizzy's may not be ideal for the engine. If possible, a 16v dizzy is best, obviously.

Carbs? Well, you can put them on quite easily, I reckon. I went to the hassle of welding on a plate onto the 16v manifolds, but then I thought 'hang on, why do I need to weld?'

Why not look at making up a plate to take the carbs, then with a combination of good flexible grade epoxy ( Eccobond 104?)and some strategically placed bolts threaded into the manifolds, bond the plate on to the manifold. The assembly does not have to be mega strong, it will go to a max of 120 deg C on the worst possible day (epoxy can easily take that), and just has to seal against a modest water pressure. If you have been careful, it should perform perfectly well, after all, it's a method used in the aircraft engine industry.

The injector holes could be tapped with a coarse thread, then blanked off using bolts and a bit of loctite.

After all this is said and done, I think that it is feasible and could be done relatively cheaply, just remember that you will need an electric fuel pump, and a good rolling road session to sort the jetting. 40's from a late 1.7 33 are the best bet.
The dizzy is driven off the oil pump drive. Not sure if the 145/6 oil pump drive is machined correctly.

Fitting the carbs would not be a bolt on job. The 16V throttle bodies have coolant passages cast into them.

As your car has injection already the easiest way to do it would be to buy an aftermarket injection ECU and wire that up to the existing injectors / pump / etc.
Check out www.needforspeed.co.uk for other mods, you may have to look at the 33 16v catalog for mods.
 
G
#3 ·
Sorry to put a downer on things but what happens when MOT time comes round? Just because a cat has been removed doesn't mean the car doesn't require a cat test! And you aint got a hope of getting past a cat test with no cat fitted and carbs set for more power. Any vehicle built since 1992 must have a cat fitted by law and must be able to pass a cat test when operated on the road. The best way to mod this engine is to do it electronically and retain the cat, perhaps aiding the inlet of air and fitting a performance exhaust system, this is the only way to remain legal. Plod has been taking lessons so they know what to look for.
 
G
#8 ·
Sorry all records are going to be on computer and linked directly to the DOT. The only way to get a ticket would be if your friend accidentally connected the wrong car to the test equipment to gain a pass. But that couldn't happen, could it???????????
What a silly mistake. Nevermind, hate to get political but sometimes it would be nice to be able to play without someone always spoiling our fun. I have a friend who races a 1700, I will ask him what mods they do, I do know they drop the engine to lower the centre of gravity to help cornering. I will get back to you.
 
#9 ·
I have found the engine mod i want.

It is on Alfaowner main page.
A 2.5 V6 engine by clover tech. Me want Me want
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When is that review going to be on the site.

Does anyone have a website address that works as the only one i have found does not work properly.

I needs to find out how much this will cost
*starts emptying pockets into very large piggybank*
 
#11 ·
HWE I've got a similar engine to you..
I've got a 1.7 16v flat 4. but its a pre cat engine so as standad it's 137bhp but anyway..
I've got a K&N induction kit (from deamon tweeks), a full stainless steel 3" exhaust system (from redlinemotorsport.co.uk or was it .com???) and a custom remapped ecu also form redline. this has boosted my car from a mear 137bhp to 167! and for less than ÂŁ700! fitted!. there are loads of other things you can do to you car. have a look on www.needforspeed.co.uk. they have stuff for a very wide range of cars and I've got all sorts of stuff on order form them..
I'm going to add a turbo to my engine later this year (dec or jan 02) so as and when i find out more details about that i'll let you know. oh and check out www.alfasalv.co.uk for chips too. they are pritty good offering about +8-10bhp for only ÂŁ120!!!

hope this is of help.
Luke.
 
#12 ·
I thought that you couldnt get a turbo for a boxer.......
I got to get me one of those.
I have just put a K&N panel filter on and it has made a massive difference to the amount of low end torque. it now pulls a lot more cleanly from 1500+

The next thing on the list for me is a Motec ECU and Eibach lowering springs.

then in september a Powerflow exhaust goes on, and the cat comes off..
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that should do me for a while
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#13 ·
HWE.

No one makes turbos for the 33 flat 4 but if Subaru can do it so can I!!
anyone can add a turbo to any engine (sweeping generalisation there) so long as the support parts are upgraded too. e.g. gaskets and seals. also the ecu will need re doing and some new cams and also a new manifold and exhaust system.. but any car can have a turbo! mine is going to be a one off (I know other peeps have turbo'd 33's before) and it's going to be mad!!!

never be put off by the 'NO' people! just do what you want to and enjoy it!
 
#14 ·
Nice !!
I have allways been put off by turbos as i have heard so many storis about them overheating engines and damaging them. (probably all crap)
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I don't think i will be able to go too extreme on engine mods as i am only 22 and the insurance for my motor is already ÂŁ1k a year
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fully comp. (thats with 4years NCB)

When i tried to get a quote for my car with a bigger engine most of the companies quoted the same price as i paid for the car
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(well most companies wouldn't even give me a quote)
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I think i could get away with gas flowing and porting the heads. (what the insurance company can't see won't hurt them)
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