1430cc motor
Turbo Mini Forums

Okay, so after reading a bunch of threads, the general consensus is that a 1430cc motor will not work for turbo motor, due to the compression ratio. Would it not be possible to chamber the head to 30cc, and get a custom piston from JE pistons or some such with a large dish? 15-25cc dish maybe? That would lower the compression immensely I would imagine, with 45 to 55cc's of room... Any thoughts?

-James

What is your end goal? Power wise?

I'm thinking over 150bhp. Hopefully way more, but 150bhp would be fine with me.

-James

No need for anything fancy then, a well built 1293 will easily make 150bhp without needing massive boost pressure either.

James am i right in thinking your intending to use the small bore motor mention in your other thread to go 1430cc etc with?

If so, you'll need a 1275 block, not a small bore block.

Or is it two different engines your planning on building?

James,

I suggest you put your location (USA I presume) in your profile - it helps people especially understanding the time differences between posts and replies....

Rod.

Schrödinger's cat - so which one am I ???

I am USA, I'll update that right away. I do intend on making two different blocks, the 850cc for my driver, and a large motor for my '63. How much could a 1430 get, if built very well? Also, is a 1430 just an overbored 1275? I would like 200bhp or more, if possilbe. I'm wanting a high bhp A-series, so that I can be a little more competitive in the scca.

-James

1430 is overbored and stroked

Yup overbored to 73.5mm, and the crankshaft stroked to 84.3mm, or you could have a 1425 84mm stroke.

Also remember for a stroker you need a pre a+ crankshaft, with ground fillets, rather than rolled (rolled fillets being found on a+ cranks).

I think to be fair with a 5 port N/A engine 200bhp with out nitrous is overlly optimistic. With out nitrous i think you could get 150-160 with money and the correct combination of parts! I say this figure as im sure Paul Wigintons sprint has got just over 150bhp.

Edited by Oli on 15th Jul, 2009.

Now, I'm fine with spending the money, as for the 850 I'm having custom stuff done(crank, rods and pistons) all coming to about $6500 U.S.(I think that's about 4,000 pounds). If I were to take a 1275 and just use it for the time being, when I had the money to take it to a larger size, I could just do the same with that motor(custom crank, rods and pistons) And get better bhp out of it couldn't I?

Probably the most powerful proven 5 port Turbo Mini in the world is iirc a 1293, and the countrys fastest proven Turbo Mini on the 1/4 mile is also a 1293. Is there really any need to go any bigger ?

WWW.TURBO-MINI.COM

Yup you could do that.

Although the custom parts aren't really needed. Standard crank and rods are more than up to the job, after they're undergone various machining operations.

But if you want to spend the money you could even go 1460cc, using a billet crankshaft with an 86mm stroke.

With the large cash sums, there are lots of options available.

There are lots of options, but little point. If you are after lots of power, spend your cash on the turbocharger, not more capacity.

Woops, i just noticed you wanted to turbo it!

In this case the larger capacity as said by Tom and Phil, is the to be fair not a nesseccary route.

Like they said 1293cc with the right turbo, can make 200bhp Nics mini being the perfect example.

Edited by Oli on 15th Jul, 2009.

And with the right gears would have no problem doing over 100mph? If so, that's the route I would like to go then. I want high bhp, with really good acceleration and top speed so that I can be competitive in the racing scene stateside. What turbo would be best then? T3, or would the newer t3/t4 hybrid be a better choice, or would the lag be too much for the desired effect?

The T series Turbos are old hat. Do a search on the newer GT range. A lot of people are moving onto these now.

WWW.TURBO-MINI.COM

I think you'll find there are cars on here that will top 100 in third gear.

I'll look into the GT series for sure. How do they manage over 100 in 3rd? I would love to know!

-James

Gearing and enough revs, and the power to pull it.

I run a 1430cc NA road car, and it pulls 100mph in 3rd on the track (3.44 diff & 13" rims).

The bottom end torque is fantastic, but I would go turbo standard stroke if chasing peak power & reliability.

You're not impressed with the 1430, or you just think it would be way too much hassle/overkill to use a 1430 for high horsepower and get good results?

-James

It's more of the point that the 1430 isn't needed in this situation, and high power outputs are more than acheivable with a 1293cc engine, so 1430 would be a pointless overkill as you say. And it would be a hard task getting the CR down to run decent boost.

Edited by Oli on 16th Jul, 2009.

In my own opinion, I would avoid seriously large cc for reliability reasons.

Read Vizard's yellow "Bible".

Stroking a crank makes it weaker (unless you buy a billet one)

Large bores thin the cylinder walls so they distort when running and also don't allow the head gasket to seat properly.

I have gone for 73mm (1360cc on a standard crank), not 73.5mm or 74mm, and even then I offset the bores slightly to keep the 2-3 wall thickness adequate.

The gasket just avoids overlapping the bores, although the one I used for all the measurments has gone back as it was one of the dodgy Belgium ones.......

Schrödinger's cat - so which one am I ???

To be fair Rod, although removing material will make it weaker, I cant think of any examples where one has failed.

Although i am more than happy for some one to give me an example.

(Not trying to start an argument or anything, i am actually interested lol)

As im doing a stroker for one of my minis.

Schrödinger's cat - so which one am I ???