1349cc project

[Legendracer]

New user here, got into Hill Climb & Auto X-ing a FJ powered Legends car. 1349cc (Wiseco pistons, Carillo rods, Lighten crank) Water Cooled, and converted to EFI

[fj1289]

Interesting project.

What ECU are you using?  What TB's?

A Hank Scott water cooled block I assume?

What headwork and cams?

[RPM - Robert]

Interesting project.

What ECU are you using?  What TB's?

A Hank Scott water cooled block I assume?

What headwork and cams?

The Hank Scott one's that have came through here were billet but they were not finned like that. Maybe someone modified it, his ports were similar if I recall.

The thunder roadster water blocks were cast. I think that might be a Baby Grand race car water cooled block.

[Pat Conlon]

Hope the oil rings on your 82mm Wiseco pistons work better than mine did....then again, probably not an issue at WFO on a race engine, but definitely an issue on a street engine. Upon closed throttle deceleration, the vacuum and poor oil ring seals sucked up a quart of oil every 800 miles.

Love to hear more about your EFI...

[JohnnyTheCraneGuy]

Hope the oil rings on your 82mm Wiseco pistons work better than mine did....then again, probably not an issue at WFO on a race engine, but definitely an issue on a street engine. Upon closed throttle deceleration, the vacuum and poor oil ring seals sucked up a quart of oil every 800 miles.

Love to hear more about your EFI...

Now where have I read about those rings.. 

[giantkiller]

Hope the oil rings on your 82mm Wiseco pistons work better than mine did....then again, probably not an issue at WFO on a race engine, but definitely an issue on a street engine. Upon closed throttle deceleration, the vacuum and poor oil ring seals sucked up a quart of oil every 800 miles.

Love to hear more about your EFI...

Yep still have those rings in my 1350r. Sucked oil from day one. Someday have to go the route you did Pat. Or maybe use one of the 2 billet bigbore cylinders that I have. I really would like to know about the feul injection too.

[JMR]

Hope the oil rings on your 82mm Wiseco pistons work better than mine did....then again, probably not an issue at WFO on a race engine, but definitely an issue on a street engine. Upon closed throttle deceleration, the vacuum and poor oil ring seals sucked up a quart of oil every 800 miles.

Love to hear more about your EFI...

Pardon my ignorance but I'm not familiar with the rings you fella's are referring to. Is it the type of ring pack or the quality of the rings?? Example...are they the thin XA rings or XC or XG. I've use all of these rings packs in the past and can attest to The XA rings....especially the oil rails....to be a PITA to install and get to seal in less than perfect bores. I can also recommend not using the XA's in any turbo or supercharged bike engine.

[Pat Conlon]

Hi Mike, good to hear from you.

I can't recall the ring pack used on the HSR short skirt 82mm pistons. I do know that the oil ring tension was the suspected culprit. The pistons could have removed and the ring lands deepened to accept a thicker oil ring with more tension but I went ahead and converted over to the long skirt 83mm Ross pistons...all is well since.

 What's good on the track is not necessarily good for the street.

Here is an old post on the then new HSR short skirt pistons vs. the traditional JE pistons...

Ok so here are the pictures, courtesy of Randy@RPM:

First the standard JE 1250cc pistons:



Now the new 82mm Wisecos, look at those short skirts and wrist pin:



Wrist pin difference:


No word yet on pricing.....

[JMR]

Thanks for the quick reply Pat....hope life is treating you well! The short and abbreviated skirt circumference could cause problems with long strokes and larger bores....a lot of piston rock. The rings look like XC which are pretty standard for aftermarket bike street engines. That being said 4 stroke MX pistons are basically a nail head with XA rings and they seal well. Same goes for F1 engines.

[RPM - Robert]

I do believe the HSR are XC.

Ring packs do keep getting better and better. We are running 1mm top, 1mm 2nd rings, and the oil control rings are only 2mm tall, in the new LS7 440ci, stroker with 4.185" pistons, 14.07:1 compression, engine we are building for Ryan's Miata.

I think it is more the Wiseco piston design, as Mike mentioned. The 1319 and 1297 Wiseco kits with that same design we have heard of oil consumption problems from a few different engine builders.

[Pat Conlon]

....The 1319 and 1297 Wiseco kits with that same design we have heard of oil consumption problems from a few different engine builders.

IIRC Aviation Fred had the 1297 Wiseco's in his engine, the largest piston sleeves that could fit in the stock (unrelieved) engine case. I wonder about his oil consumption?

What say you amigo?

[RPM - Robert]

Just looked at Hank's kits he is using/selling XG ring packs and the Andrew's kit that Fred is using are XC ring packs. Both Wiseco slipper skirt pistons, so if Fred's isn't using oil then it looks like a ring pack problem, if it is using oil maybe the skirt and piston rock contribute.

No issues with the full skirt Ross for sure. The LS is getting custom Ross pistons made currently.

[Pat Conlon]

No issues with the full skirt Ross for sure.

Yes, I'm very happy with my RPM engine with the Ross pistons, very happy.
Came off of a 4K mile tour last spring and used very little oil, about 1/4 quart.

Engine runs like a top....

Robert, you guys staying normally aspirated on the LS?

[RPM - Robert]

No issues with the full skirt Ross for sure.

Robert, you guys staying normally aspirated on the LS?

Yes sir. Hoping be around 750-800 hp and maybe a touch over 700-750ft lb torque to the wheel. We have around 20% parasitic drivetrain loss after adding the Winters quick change.

Bought a 525hp LS3 crate motor and made 419hp/390 ft lb to the wheel with a FAST 102mm. Put a 4150 Wilson Manifold t body and a single plane high rise and that bumped it to 489hp and 424 ft lbs.

This LS7 was in a Formula drift car and made 660hp and 590 torque with a stock corvette intake with 4.125" pistons and 12.5:1 compression. We are hoping with the new higher .700" lift cam, increased bore to 4.185", higher compression, and the 13+% gain from a better intake we will be up there.

[Pat Conlon]

Sounds like a hairy E85 beast of a Miata Robert.
I wonder if tires will be the limiting factor?
You can only get so much width under that Miata.