stock EU2 1.6 on jenveys

[analog_me]

I have a stock cylinder head fitted with a 421 exhaust, mild 252 degrees 1611 kent cams and an Emerald. How much power should i expect if i add a set of jenveys with 90mm thumpets?
No plans for a headwork just proper fitting of the TBs to the head.
Thanks

[ForzaGilles]

I would've thought about 10bhp. Have you had a look at the www.dvapower.co.uk website? Lots of good info on tuning the K-Series on there.

[analog_me]

Well there are people claiming 148hp and others up to 165. This is a big range for the same state of tune... Similarly the original r300 had 160, a stock head even a stock exhaust.
So what should I expect? Torque appears between 12.2 and 12. 7 in all cases.
Do you have any personal experience to share?
Thanks

[BertBert]

analog_me said:

Well there are people claiming 148hp and others up to 165. This is a big range for the same state of tune... Similarly the original r300 had 160, a stock head even a stock exhaust.
So what should I expect? Torque appears between 12.2 and 12. 7 in all cases.
Do you have any personal experience to share?
Thanks

I also don't think you will be getting 160bhp just by bolting jenveys onto a 1600 with a stock head. The R300 on roller barrels was an 1800. Can't recall if it was standard head though. Looking at the DVA site gives very good guidance on what can be achieved with what. Although looking at the K04 kit, it doesn't mention head work. We need DVA here to opine. Last time I ventured an opinion on what could be achieved, he put me in my place (nicely)!

As to personal experience, the legendary Peter Carmichael learnt about porting the k-head on his 1600 supersport engine. This was on his way to producing his ground-breaking 258bhp 1800 k, winning the "battle of the titans" those were the day! It the 1600 produced a nice 160 bhp on jenveys. Can't remember whether it was still SS cams or not though. I do remember the noise of hacking away at the head really pissed off the neighbours - my neighbours as this all happened in my garage with me making the tea.

Bert

[ForzaGilles]

analog_me said:

Well there are people claiming 148hp and others up to 165. This is a big range for the same state of tune... Similarly the original r300 had 160, a stock head even a stock exhaust.
So what should I expect? Torque appears between 12.2 and 12. 7 in all cases.
Do you have any personal experience to share?
Thanks

I had an EU3 1.6k on a standard head with Piper 285 cams, forged pistons, Jenveys (with 90 trumpets and BS airbox) and a Powerspeed 4-2-1 exhaust (non-cat) and that made 159bhp and 129lb ft on Northampton Motorsport's rollers after a remap. I would think yours would be around 150bhp-ish due to the milder cams.

[analog_me]

ForzaGilles said:

analog_me said:

Well there are people claiming 148hp and others up to 165. This is a big range for the same state of tune... Similarly the original r300 had 160, a stock head even a stock exhaust.
So what should I expect? Torque appears between 12.2 and 12. 7 in all cases.
Do you have any personal experience to share?
Thanks

I had an EU3 1.6k on a standard head with Piper 285 cams, forged pistons, Jenveys (with 90 trumpets and BS airbox) and a Powerspeed 4-2-1 exhaust (non-cat) and that made 159bhp and 129lb ft on Northampton Motorsport's rollers after a remap. I would think yours would be around 150bhp-ish due to the milder cams.

Makes sense to me. I think a standard head has a thetorical potential for max165hp.
Also itb should be able to release a good 15hp. In which case 150 sounds reasonable to me and at pear to dva k16 kit but to confuse all dva k04 kit is good for 160hp. 🤔🤔🤔🤔

[DVandrews]

The R300 was a Supersport with roller barrels, the TBs were matched to the head, but the head was otherwise standard, they used the R500 exhaust and made between 150-160BHP.

The K04 kit on my website uses hotter cams and makes between 155-165BHP with a decent exhaust manifold, realistically I would expect a 1600 with 252 degree cams, throttle bodies, decent exhaust and properly timed cams to make around 150BHP, with hotter cams like the 633 or 1320 then another 5-8BHP might be in the cards depending in how accurately the head was machined.

I remember lending Peter the tools to finish the porting on his SS head, ISTR porting one cylinder for him to copy. His *big* head for the 250+ engine was done here by me, I remember it well.

Dave

Edited by DVandrews on Sunday 19th April 17:03

[analog_me]

DVandrews said:

The R300 was a Supersport with roller barrels, the TBs were matched to the head, but the head was otherwise standard, they used the R500 exhaust and made between 150-160BHP.

The K04 kit on my website uses hotter cams and makes between 155-165BHP with a decent exhaust manifold, realistically I would expect a 1600 with 252 degree cams, throttle bodies, decent exhaust and properly timed cams to make around 150BHP, with hotter cams like the 633 or 1320 then another 5-8BHP might be in the cards depending in how accurately the head was machined.

I remember lending Peter the tools to finish the porting on his SS head, ISTR porting one cylinder for him to copy. His *big* head for the 250+ engine was done here by me, I remember it well.

Dave

Edited by DVandrews on Sunday 19th April 17:03

Thank you David, this explains all..