302 Rebuild

[07cob]

Originally Posted by AC-460

I think while youve got the engine stripped down this far I would be boring it and throwing in a new set of pistons to match those new heads....
Take one of the old rings off and put it in the bottom of the bore measure the end gap....now put the ring in the top of the bore and measure the end gap ....I would bore it....anyway thats my two bobs worth...

AC-460

Great idea - I will check this out.

EDIT: What would you expect for a good/bad result for the gap - top and bottom?

Thanks


Geof

[AC-460]

Originally Posted by 07cob

AC-460

Great idea - I will check this out.

EDIT: What would you expect for a good/bad result for the gap - top and bottom?

Thanks


Geof

The bore will always wear the worst right at the top of the stroke where the piston gives a slight rock before it goes back down...when you hone an engine you usually keep honing until youve honed these wear marks out....
By doing this you take more meat out of the top of the bore than the bottom....so when you put your new ring in the bottom of the bore the ring gap will look OK but when you bring it to the top the gap will have probably doubled this cause poor compression and wears the piston ring shoulders because the ring is continuously opening and closing... the oil rings will wear first causing oil usage.....

[Merv and Sharon]

That is one of the things about the way the Original Cobra image has developed - motors like that are as attractive as the cars themselves.

[Merv and Sharon]

Tough engines Geoff! However, not as much weight on that engine stand now ..

[07cob]

Merv

Not sure about tough. I don't know if this engine has ever seen much service at all. There is a complete lack of wear all over the engine - pistons, bores, crank. One of the main bearings shows some minor signs of wear but that is it (apart from the damage to No.2 - which is effectively cosmetic). Even the bores had very little lip on the top of the cylinder. I wiped off the carbon deposits and dropped the pistons - easy. No need to machine or scrape the lip off. I'v only ever rebuilt a couple of engines but this is the best I've seen. So, yes, they are either tough or this one has done very little work ... or maybe a bit of both.

Geof

[hsv300]

I have the 4.6 litre Supercharged SVT motor in my cobra the Coyote is the same size so i'm sure they will fit into the Harrison Cobras.

[Gav]

Half the price of a Windsor I said Tomcat.

[Modena]

An un-opened LS1 with proper tune will make (has made!) 310kw@fly. A properly tuned un-opened LS3 I would hazard would be 340+

[Merv and Sharon]

I think that the original Cobras had about 350 HP, give or take. That seemed to be enough to see off the more powerful Chevies of the day in the SCCA. However, we can have as much power as we are able to pay for now in either the original Ford heritage or now, the Chevie. The cost of new Ford or Chevie motors are pretty similar it seems. The costs of speciality built motors is higher. I wonder if it is all about the balance between three things: the set up of the car, the power of the motor and the ability of the driver.

Too much power and not enough ability and, "this is the one that will kill me!" I am not where near the power (or the ability) some of you are talking about and I find it more than enough on the road.

Now Geof, what pistons are you getting?

[tomcat racing]

well said merv, i was just addressing some statements made here that i thought were bulls++t, and could not let them go unanswered.

[Beejay]

Tomcat,

Not bull**** mate. A cammed LS3 will make 350 kW at the wheels no problem. It will start first go every time, not overheat and deliver good fuel economy.

If you love Fords that's great. You are however kidding yourself if you think they offer the same power per dollar as a Chev.

For the record, my current daily driver is a Ford, and there are a few others I would happily have in my garage.

All in good fun mate!

Ben

[boxhead]

Nah bugger you Ben, Fords are $hit

[07cob]

This year at the Nationals, I understand that there will be a friendly State of Origin competition. Would it be worth considering in the future (surely too late for this year) to include a Ford vs Chev showdown. There would have to be enough LS powered Cobras now to make this a reasonable comparison.

[tomcat racing]

beejay
i was referring to gavs first statement that ls engines [make more hp, for HALF the cost]

it depends on what you are comparing your engines to, if you want to be perogative thats your choice

350rwkw is great, no denying thats bang for your buck

im really happy for more of you guys to be sticking gm engines in your cobras, it just makes a ford engined one more exclusive

gav, evolution is the coyote

[Tenrocca]

Yeah Grange is bloody great, bit of cork taint at the moment though hey Phil, Ash, Wazz....etc

[Tenrocca]

Time to bring your car to Nats tommy. You can go in granny shift class with Gav - winner gets a years subscription to Cosmopolitan and a bikini wax.

[tomcat racing]

OH Andrew, dear poor andrew,

please engage brain before putting mouth into gear, is''nt that what they teach you university types.

[Tenrocca]

Originally Posted by tomcat racing

OH Andrew, dear poor andrew,

please engage brain before putting mouth into gear, is''nt that what they teach you university types.

"University type"

Is anyone outside of QLD that completed more then grade 5 a "university type"?

Why wasnt there a big go like this on the last LS engine rebuild thread - Oh thats right - there never has been a LS engine rebuild thread.

[boxhead]

Originally Posted by Tenrocca

"University type"

Is anyone outside of QLD that completed more then grade 5 a "university type"?

Why wasnt there a big go like this on the last LS engine rebuild thread - Oh thats right - there never has been a LS engine rebuild thread.

Touche.

[boxhead]

Come on Tomcat, bring your car down for the Nationals, your closer than I am.

P.s, I will add that I do not intend to do any spanking as my problem is no doubt driver skill, as my car makes more than enough power to turn a decent time.