Hillman Imp 1200cc (stealth engine) in a standard height block build / dyno test

[@stevecmason-rs6vf]

Great explanation about ratios and burn etc. Gave me more insight than I'd had before. Thanks Andy

[@thehillmanator]

Glad you enjoyed it

[@byronmills5952]

Marvelous! 👍👍 Shall be very interesting to see what exact figures it makes after mapping. 😊

[@simonjoanna2432]

Andy, great to see the Imp engine still being developed! I once owned a Paul Emery 1150 engine, I never had it running as I dicoverd a crack in the block under the centre main bearing, it was a Mk1 block and really not ideal...super video, thank you.

[@thehillmanator]

Thanks for the info!, i have a paul emery block may do a little video on it

[@carloswheeldon2553]

Its nice to listen to somebody who knows what they are talking about. 👍🏁🏁

[@thehillmanator]

Thanks for kind comment, i make most of it up as i go along 🤣🤣

[@carloswheeldon2553]

@@thehillmanator thing is , thats how engine building go’s you encounter an issue with clearance for example you deal with it! 👍 its all a consideration! Keep up the great work! 🏁🏁

[@simonbertioli4696]

Very very interesting...l shall send it to my son in the UK. Yup one always learns...even at 68.. 👍👍 Can't wait until the next video appears....

[@timpayne8238]

Great vid Andy, that engine sounds sweet. - You're quite an engineer and I admire your confidence testing a new engine although I imagine they're pretty strong internally.

[@thehillmanator]

Thanks, yes very strong engine even in standard form! I get bored with repeat work so always looking to spice the job up a bit ! Even if it doesn't work always a learn to be had !

[@havenview]

Ian used to spend *hours* grinding out the ports on the heads, all by eye using a die grinder on a flexi shaft to his pillar drill, constantly checking wall thickness. They all looked identical at the end.

[@thehillmanator]

hi steve, well if you ever want a job….

[@briangomm8391]

Nice one Andy, great to see you're still developing these engines.

[@thehillmanator]

thanks yes always trying new things to try and squeeze as much out as possible 🏁

[@Ralph2]

Lovely. Wish I still had my 998, great little cars.

[@raymond_rayder]

This is awesome, Andy. Didn't realise you were even making videos.

[@thehillmanator]

More to come!

[@looneyliron]

Great video Andy Your the conductor of the Orchestra bring it altogether, can’t wait to get my engine to you 👍

[@thehillmanator]

Thanks 👍

[@bwautoian]

Enjoying your vids from here in the States! Will be in touch once I know what we’re working with between my two Mk1s. Good luck this season!

[@thehillmanator]

Thanks, you too!

[@TonyJewell0]

Very interesting video - thx for taking the time to explain all this.

[@chevyimp5857]

Great video... So many nice bit on this engine.. sweet

[@thehillmanator]

thanks, looking forward to seeing how it goes on the posh dyno for mapping

[@skamanfrank]

Cracking video Andy, awesome looking engine too!

[@thehillmanator]

thank you

[@andysaunders3708]

Beautiful engine!

[@sonnyjimbod]

Really interesting video! Would be nice to see what sort of figures it puts out once fuel injected.

[@thehillmanator]

thanks, i am thinking of doing a follow up video at the engine shop where it is been mapped 👍

[@gothicpagan.666]

Ports of that size are allways going to make torque high in the revs. Old factory R17 is still above 5k on a 1.2 bottom end. Never stop learning👍

[@thehillmanator]

every day is a school day !!!

[@finlay230]

great vid, very interesting

[@thehillmanator]

Glad you enjoyed it

[@trsfc1595]

Nice Work

[@wendellfugate4225]

Looks pretty clever. Cheers!

[@thehillmanator]

Thank you! Cheers!

[@darthbarmey6482]

excellent, I want one 😀😀😀😀

[@MrT01582]

Hoping for a lottery win so I can get the 3 cars I've wanted forever

[@thehillmanator]

Me too !

[@peterjohn3180]

That cam looks brutal! Could you run longer rod and piston with gudgeon pin closer to crown and run single ring and oil in fuel?

[@maryginger4877]

I'm guessing its going to make 100 BHP - and be driveable... impressive .

[@thehillmanator]

follow up video coming soon, yes hopefully 🤞

[@andysaunders3708]

Weird. I always believed that longer stroke meant more torque. Or have I missed the point?

[@thehillmanator]

yes your dead right, this is more about the rod length which is nothing to do with the crank stroke, i will try to explain more in my next video 😂

[@philiphoyland6619]

Great stuff will you build me one?

[@thehillmanator]

Sure, why not

[@peterjones7935]

Why no support for the rear main bearing? If thats the one that has as much, if not more load that the other two, with flywheel & clutch loads, etc?

[@thehillmanator]

hi, the rear main cap is fully supported down each side by the block and has the sump bolt to it as well, it is simply better left untouched in my opinion, the caps are made from LM 24 and very strong.

[@williamallenfranklin]

With the wrist pin shrouded how does it get lubricated?

[@thehillmanator]

Hi, the top of the rod is drilled to aid lubrication.

[@Tal5258]

What brand is the pistons Omega?

[@thehillmanator]

these were cp

[@orange6079]

Cool

[@bobawatsit]

torque > hp is all in the cyl head and cam, the intake and exhaust tubes will allow you to tune as will cam adv/ret crickey 11.5 : 1 gotta be a lot of O/L on that cam > can you post specs lobe accel and velocity numbers would be nice

[@thehillmanator]

Hi, sorry cam figures are secret to my cam designer bob jones,he uses a lotus software to design the profile, lots of red boxes but he knows what works ! 11.5 tame for short stroke imp

[@bobawatsit]

@@thehillmanator No worries, I can figure out pretty close to what it is, no real secrets when it comes to performance orientated design. looks like you are well over 0.25 L/D, duration is not that short and lots of spring