INSANE 4G63's with 700lb-ft of torque and 43PSI at 4,000RPM [TECH TALK]

Описание: You can make as much power as you want with a high-boost turbocharged application, but if you can't seal the head to the block correctly,it'ss all for nothing.

Julian Godfrey runs us through building a 4g63 rallycross engine that uses a 45mm restrictor plate and the challenges of hitting 3 Bar of boost as low as 4,000RPM. Explained is how the 700 lb-ft of torque that can be produced at those low revs is in the cylinder for longer due to the slower piston speeds compared to high boost and high revving applications. This means the pressure in the cylinder remains longer, causing flex and putting everything under more stress, particularly the head gaskets.

Touched on is some of the testing Julian has done in regards to bigger head studs and how, for this 4g63 application, they made things worse until the fitment of a 12mm steel plate for added strength, which comes with its own complications relating to cambelt length and manifold positioning. If you're still trying to put the name and face together, note Julian is well known for his work with YB Cosworth engines in the likes of Ken Blocks, Ford Escort Cosworth, RS200 builds and more.

Julian and Andre also discussed cylinder liners, aka sleeves, and the NIKA-steel and Titanium nitride coatings required for steel-to-steel contact. The benefit of a longer rod relating to component stress, along with a little knowledge bomb on how 2 head gaskets together proved a great solution for this specific setup rather than going to the time and expense of o-ring-style sealing.

TIME STAMPS:
0:00 - Cylinder Head Limits
0:25 - 4G63 & 45mm Restrictor
1:01 - Peak Power
1:09 - The PowerIsn'tt Important
1:30 - Boost Pressures
1:43 - Why Head Gaskets Struggle
2:25 - 4G63 Block Flex
3:10 - Bigger StudsDon'tt Fix This
3:58 - Steel Plate Solution
5:01 - How It Is Setup
5:47 - Nikasil Flange Liners
6:25 - 1mm Sleeve Thickness
6:47 - Nikasil Coating
7:15 - Rod To Stroke Ratio
8:10 - Thanks Julian!
8:40 - BUILD.TUNE.DRIVE

Win FREE ECUs, engine components, wiring tools, alignment setups and more. Enter now, no purchase required: https://hpcdmy.co/giveaway

🏎 Want to learn how to tune EFI? Start here instantly and for free: https://hpcdmy.co/EFI101y

Website: https://www.hpacademy.com
Julian Godfrey Engineering: www.racetuners.com
Contact: [email protected]
Merch shop: http://bit.ly/MerchHPA

#highperformanceacademy #learntotune #juliangodfrey #juliangodfreyengineering #fos19 #goodwood #rally #rallycross #rallyx #enginebuilding #billet #cast #tech #hpa #4g63