Eagle2000GT

I've read posts from people who were very disappointed with their stroker engines. And I've read posts from people whe were very happy with them. I think its all about expectations and how you set up the motor. From what I've read the longer stroke will give you more low end torque but that it will have increased wear because the piston skirt leaves the cylinder. Some say it won't rev as high because of increased rotating mass and mixing it with high end cams is a bad idea.

While there is no replacement for displacement, not all displacement is the same. Mod motors already have a long stroke (3.55" bore x 3.54" stroke) stretch the stroke to somewhere around 3.85" to get a 302 ci motor is not really the same as having one with a 4.00" bore and a 3.00" stroke (pushrod) or one with a 3.70" bore and a 3.54" stroke (Cammer 5.0). It's the bore that limits these motors, not the stroke.

defconfire

+1 The bore to stroke ratio is horrible on the 4.6. It has more stroke to bore stock than a chevy 383 stroker.

And because of this small bore the valves become shrouded. Adding more stroke will do almost nothing, infact it can hurt your topend. If you look around people with 2v's that do 5.4 swaps make the exact same hp #'s as people with the 4.6.

I always wanted to try this. De-stroking the engine and boring it as big as i possibly could and rev the crap out of the engine. Probablly get it close to a 4l or a 4.2l with the larger bore and slap some 4v heads on it with some aggressive cams and rev the thing to 8.5k

BMW did that on their new M3 V8 and it worked well. 4.0l 8.3k redline and 414hp

SVTfan4life

^hmmmm...interesting...

Miceleb

Very good arguments....Now im wondering if I did a 5.4 swap would it pass emissions...Is the 5.4 block alot bigger than the 4.6 will it bolt right in?

medrick

ive got a question too. could you use a block from a pushrod or do the heads bolt up differently? cause then you could have a 347 mod motor. probably not possible since ive never heard of it.

Miceleb

The head on the mod motor is about twice as wide with over head cam, so no that def would not work......if life were only so easy. Plus there is about 100 other contributing factors that would not allow it. Head angle, valve angle, cylinder placement....etc.

10inch Terror

That's what we did with the N/A modmotor we built for my brother. Detroked, big bore 5.4 4V. Would see almost 11,000 on the engine dyno. That being said, i'm also a BIG fan on stroker motors, hench the reason i added stroke to my turbo motor. It really comes down to what the car is meant for and what the end combo will be. A stroker motor is great for a heavy streetcar as TORQUE is king on the streets. It's what gets you going from stoplight-to-stoplight in a hurry. So for a N/A streetcar, i'd add stroke. For an N/A RACECAR..i'd add bore and spun it higher rpms. For a turbo car STROKE absolutely. Turbo's LOVE stroke...the longer the arm the better. For a big centri blower car, I also like to add stroke to help get some bottom end power in the motor before the blower starts making big boost in the top end. A stroked 2V makes BIG TORQUE..which makes for a fun streetcar.

ZW99GT

Lies.

Fobra

I agree with Terror, I know alot of stroker motor who turn major rpms, but alot of the arguements here are much more complicated then they are being made. However to make a long story short, imo... if you want to bore and stroke something, do it a 5.4

WhiteFoxGT

He went on like 2 of the MD cruises held by Flewbyu and I see him every now and then out n about.. Unless he lied to my face and a buncha other people... I've seen that car run down an Evo that was trapping 126mph