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Sharks-Parts
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5,659 Posts
Discussion Starter · #1 ·
Greetings -

what would be involved to take an 1130cc engine and make it a 1250cc engine?

swap jugs and pistons?

thanks
 

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Registered
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1,037 Posts
You have to bore the cases, from my understanding an 1130 to 1250 is all the screaming eagle big bore kit they used to make was.
 

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Premium Member
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9,332 Posts
No, I wish it was that easy. The cases have to be split so they can be bored to accept the 1250 cylinders larger diameter spigots. It ends up being close to a $5000 job including the 1250 kit for maybe a six horsepower gain. I looked at doing it and gave it a pass. You can get as large a power gain from intake, exhaust (if you choose the exhaust system carefully, not all work that well) and re-mapping the ECM.
There is this loon ball in my town with a stock displacement D that has had the heads ported, some sort of aftermarket cam, drilled out air box lid, K&N and Supertrapp slip ons and a dyno re-map. That thing is F-ing fast, but it gets 28 mpg if that.
 

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AIM Bagger Edition
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7,798 Posts
Weak a$$ intake cams as well. When you install the HD 1250 kit you use the same stock exhaust cams.

Sharkey if you have a customer considering this please try and talk him out of it and save him the disappointment.

I could have cried way back when I did mine and it made no difference at all.
 

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Premium Member
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3,516 Posts
I would say if you are going to do motorwork, picking up a big bore if you can find one is a good start, but deffinatley don't stop at a 1250, go bigger.
 

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durata membro
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17,603 Posts
You are better off w a set of pistons,a Destroyer crank and the Harley performance cams.
Probably give it close to 140hp to the rear out of 1177cc's.

28mpg is great fuel mileage for a performance vehicle.I took a car that used to get 37mpg,played w the exhaust,intake and the ecm,it now gets less than 20,but the little V-6 wipps the V-8's.
 

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Banned
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1,521 Posts
Waste of time. Get a Vmax or just do what the above mentioned.
 

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Sharks-Parts
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5,659 Posts
Discussion Starter · #9 ·
he has stealth nitrous and was hoping there was a quick switch from 1130 to 1250....

Thanks for all the advice here...
 

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K.I.A. '07 AW
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10,908 Posts
I would say if you are going to do motorwork, picking up a big bore if you can find one is a good start, but deffinatley don't stop at a 1250, go bigger.
1402 or go home
 

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Premium Member
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9,332 Posts
he has stealth nitrous and was hoping there was a quick switch from 1130 to 1250....

Thanks for all the advice here...
Eh, tell him that when he blows the engine up he can rebuild it with a big bore kit. :chainsaw:
 

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Insane inda membrane
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you can buy a new 1250 from hd for about 6k almost cheaper than modifying the 1130 and you would have a spare motor.. if you are going to the expense of pulling a 1130 motor apart a 1450 is probably the best bang for the buck if you get the welded stroker instead of the billet crank..
 
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