thinking ahead to more boost: Cobra engine parts interchange?

[chief455]

Looking to get ~500rwhp when I build a fresh engine.
Is this within power limitation of Marauder block?
Can a Marauder engine be rebuilt using 2003-2004 forged crank, rods and pistons?


8 bolt crank - keep seeing these.
is their a flexplate that fits this to our convertor/transmission?
damper that will utilize Marauder front covers?

I'm sure my search did not find tons of old info,
If you can steer me to a more detailed thread, that's geat
thanks

[99SVT]

Short answer, yes to all.

No problem with the block, cobra internals can swap across (I would get higher compression pistons unless you're planning over 21psi), if you use an 8 bolt crank a matching flywheel is available.

[Jeronimojc]

What do you have right now?


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[chief455]

Short answer, yes to all.

No problem with the block, cobra internals can swap across (I would get higher compression pistons unless you're planning over 21psi), if you use an 8 bolt crank a matching flywheel is available.
:D you mean matching flexplate (with our convertor bolt pattern)?
and front damper from my Marauder with tins and Eaton swap will all line up with said 8 bolt crank?
I'm guessing yes, and thanks for fast reply!

What do you have right now?


Stuff in my sig.
Plan on a spare Marauder long block, sent to my machine shop, stuffed with Cobra internals, 98 Cobra cams and put into my car with no external modifications or weird swappings needed.
Peace of mind being forged, boost to limit of the fuel system (without meth) and block strength. Where I drive, anything over 500rwhp is wasted anyway. I don't drag race anymore and it's just sport street driving.
I thought ~400 would be enough, it's darn close, so fresh motor with a bit more will equal happy.

[Jeronimojc]

I'll have to see what your sig says when I log in from a computer. Tapatalk doesn't show sigs. Not sure what you have for boost at this time, but your plan of installing Cobra internals sounds good to me.


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[chief455]

I'll have to see what your sig says when I log in from a computer. Tapatalk doesn't show sigs. Not sure what you have for boost at this time, but your plan of installing Cobra internals sounds good to me.


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10 lb boost, stock upper, +2lb lower pullies
Eaton swap on 85000 mile motor
long tube headers
3500 stall
4.10 gears
_____________________________
I'll piece a spare Marauder long block together with enough forged strength to utilize my ported blower and added boost, but within boundaries of 93 octane and factory fuel system with high volume pump(s)
KillerChiller to maintain a cool charge.
______________________________ _______________


Anyone know limitation of Marauder block and main caps?

[99SVT]

That dampers swap straight across as well, use whichever works for your blower drive.

http://m.summitracing.com/search/part-type/flexplates/make/ford/engine-size/4-6l-281

PA makes an SFI flexplate and so do several other companies. Ford racing sold one as well.

[99SVT]

Anyone know limitation of Marauder block and main caps?

More than an Eaton blower can produce, well past 700hp. Use arp fasteners and don't worry about it. The only stock mm parts that won't survive long above 500HP are the connecting rods and pistons. The crank might be marginal but I haven't heard of one fail.

[chief455]

That dampers swap straight across as well, use whichever works for your blower drive.

http://m.summitracing.com/search/part-type/flexplates/make/ford/engine-size/4-6l-281

PA makes an SFI flexplate and so do several other companies. Ford racing sold one as well.
JW The Wheel! I had one on my blown LT-1 car, it was sweet! thanks!

More than an Eaton blower can produce, well past 700hp. Use arp fasteners and don't worry about it. The only stock mm parts that won't survive long above 500HP are the connecting rods and pistons. The crank might be marginal but I haven't heard of one fail.
hmmm, this is getting too easy....on paper ;)

time to buy a rebuild able Marauder motor and get started. Only used internal would be a freshly turned Cobra crank. New rods and pistons to lower compression a bit from stock Marauder, but higher than Cobra.
Freshen the heads, assemble and boost :banana:

[MOTOWN]

I have a PRW sfi flex plate , Innovators West make great balancers that work well , what blower are you planning on using to get to 500rwhp? (hope its not a ported eaton 112)

Stock block will easily handle 500rwhp , and a cobra 8 bolt crank , rods , and pistons (assuming you don't need to bore the block) will drop right in.

[justbob]

:D you mean matching flexplate (with our convertor bolt pattern)?



Flywheels too! [emoji3]

When I did my 6 speed I hadn't a 100% clue on what would bolt up and what wouldn't.. Especially from coming off a 2012 5.4! In the end, it all bolted up without issue. God I love modular design!




Self proclaimed Builder Of Badassery.

Buy it, Break it, Build it BETTER.
"Since 2004"

[chief455]

I have a PRW sfi flex plate , Innovators West make great balancers that work well , what blower are you planning on using to get to 500rwhp? (hope its not a ported eaton 112)

Stock block will easily handle 500rwhp , and a cobra 8 bolt crank , rods , and pistons (assuming you don't need to bore the block) will drop right in.
:confused: Why? My Posi ported came off a Cobra with no internal mods making ~500rwhp...dyno graph and all.
from seller: "I used the 60lb injectors with a Kenne Bell Boost-a-pump for my fuel set up. I had an under drive 4lb crank pulley with the 2.76 RR upper pulley. Have a MAFia adapter to regulate the mass air flow sensor. Other then a straight pipe exhaust and a tune, thats all that was done".

[Zack]

It is difficult to break the 500rwhp barrier with a ported anything roots.

You need a lot of PSI.

[chief455]

All good info, thanks!

I am not so much looking to hit or pass the 500 mark, as I am looking for my short block to handle what my Eaton swap can throw at it. Safely, and last.
If my Posi port Eaton, tunes well and makes 475-485rwhp and~450rwtq, with fully forged guts = I'll be happy.

Too costly to redo the blower set up, it looks good, seems easy enough to maintain, and I like it compared to the centri I had on a different car.

I just want a fresh motor at some point, so rebuilding what I have with Cobra guts is looking cost effective. And I can burn the candle a little hotter too. :)

[Zack]

I'm going to speak from experience to you, and I hope you listen.

The difference in 'feel' between 430rwhp and 475rwhp is barely noticeable. The difference in 1/4 mile times is also nothing worth noting.

If you made 550rwhp you would notice the difference.

You are spending a lot of money to remain in the grey area, but it will be safer.

[Bradley G]

I'll be happy to get the junk I have back on the road even at the stock powar! :violin:
I was told by my tuner, I can not make up for the loss of power from lower compression from stock to Cobra with just tuning.

[chief455]

I'm going to speak from experience to you, and I hope you listen.

The difference in 'feel' between 430rwhp and 475rwhp is barely noticeable. The difference in 1/4 mile times is also nothing worth noting.

If you made 550rwhp you would notice the difference.

You are spending a lot of money to remain in the grey area, but it will be safer.
Hear you loud and clear. My experience also.
I am very happy with the ~400 rwhp driving 'feel' from the car right now.
It is more fun than my previous 600rwhp street car, because 200 of that was just not useable in any way. It added cost to the entire build, more expensive to maintain, and freaking scary to drive :eek:

400 - 500 will keep me happy as I get older, and have less time + money for toys. The extra money to build another (forged) engine and remain in the same basic power level is for insurance.

I actually planned my build this way, due to costs. I afforded the Eaton swap this year, determined I like it. Now I will build a better motor to support the boost, swap it in and tune it up.
I almost waited, built/bought a forged motor, then bought a blower - but I'd still be n/a and have nothing done!

[99SVT]

It's good to have a spare motor.

I'm running 450whp at 13.5lbs of boost through a ported Eaton on an 8.5:1 motor. If you build something similar and either add more boost or compression you're going to be very close to the 500 mark. Getting past that is an ordeal because the Eaton is the choke point.

[chief455]

It's good to have a spare motor.

I'm running 450whp at 13.5lbs of boost through a ported Eaton on an 8.5:1 motor. If you build something similar and either add more boost or compression you're going to be very close to the 500 mark. Getting past that is an ordeal because the Eaton is the choke point.
that would be winning!!:banana:

[chief455]

It's good to have a spare motor.

I'm running 450whp at 13.5lbs of boost through a ported Eaton on an 8.5:1 motor. If you build something similar and either add more boost or compression you're going to be very close to the 500 mark. Getting past that is an ordeal because the Eaton is the choke point.
revived because very local Cobra shortblock for sale.
I saw him video a compression test showing all cylinders pump up within 10%
http://www.svtperformance.com/forums/showthread.php?1045897-F-S-03-04-Cobra-Shortblock-40k-miles

Any issues, other than added weight, bolting this into my Marauder?
I'd do rings/bearings + hone etc before putting heads on.
I could get a new rotating asembly for the same money, but this would provide a block. I would then find a set of 9 thread heads.
Can I get a smaller chamber heads = raise the Cobra compresion a bit?
No freight - it's 30 minutes away.
Thoughts?

[justbob]

Besides filling one bolt hole in the Timing cover with epoxy and swapping over your oil pan and pick up tube, there is no difference.


Self proclaimed Builder Of Badassery.

Buy it, Break it, Build it BETTER.
"Since 2004"

[chief455]

Besides filling one bolt hole in the Timing cover with epoxy and swapping over your oil pan and pick up tube, there is no difference.


Self proclaimed Builder Of Badassery.

Buy it, Break it, Build it BETTER.
"Since 2004"
_^^ this = WINNING!
Because I just scored a mint, low mile Cobra short block :banana:

Next, some fresh heads and = spare forged motor :beatnik:

[justbob]

_^^ this = WINNING!
Because I just scored a mint, low mile Cobra short block :banana:

Next, some fresh heads and = spare forged motor :beatnik:


Weren't you the one that didn't want anything to do with F/I? Are we a bad example? :)


Builder Of Badassery

[Seneca]

Nice! Congratulations

[chief455]

Weren't you the one that didn't want anything to do with F/I? Are we a bad example? :)


Builder Of Badassery
Yes, and yes!
It only took a week of reading to realize bolt on's to the N/A motor would not be enough compared to my previous cars power levels.
I did want to do the Eaton AND the forged stuff at once, but with so many high mile cars still running with the swap, why not enjoy it right away. Plus it was cheaper to do in steps.
Now even if the bottom blows, I'm prepared for the forged safety margin.
I'm soooo glad you all woke me up :D

Nice! Congratulations
Thanks! I think I found the right motor from the right guy = saving some coin with the same end result = forged Cobra strength to support the Eaton.
I'll be driving out the stock block, runs just fine, as long as she holds, until I'm fully prepared and can afford the engine swap and a bit of tuning up :cool: