By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Oct 11th

Jerry Howell's V 4 4 cycle engine

help please

All Topics | Latest Posts

Search for:  in Thread Title in  
ian j20/05/2019 20:01:58
avatar
273 forum posts
240 photos

Hi.

After some advice please.engine block drawing.jpg

I've just started to build the V4 to Jerry Howell's plans.
I've made a start on the engine block and am at the point of boring the cylinder bores. In the build notes Jerry suggest mounting the block on a rotary table with the bottom face horizontal at the top and then rotating it 135* degrees and machine the first cylinder bank then rotate 90* and machine the second . Bit of a silly question but is this the same as having the top face at the top (horizontal) and rotate the table 45* for one bank and then back 90* for the second? because rather than mount the block on the RT I was thinking of mounting it on an angle plate and using a angle gauge to set it horizontal and then 45* each way. Also I don't understand the 1.546" measurement on sheet 8 it's to/from a point in thresh air?
Thank you

JasonB20/05/2019 20:17:56
avatar
Moderator
16263 forum posts
1717 photos
1 articles

yes it is the same, the advantage of using the rotary table is that bot sets of bores will line up with the axis of rotation which could still be done with suitable marking out.

The dimension is from one edge of the right cylinder bank to the left cylinder bank but with a longer dimension line

ian j20/05/2019 23:26:35
avatar
273 forum posts
240 photos

Thanks for that Jason.

So the rotary table method is best because once the engine block is centred on the RT both cylinder banks will be aligned with the crank centre.

JasonB21/05/2019 06:55:12
avatar
Moderator
16263 forum posts
1717 photos
1 articles

You could also locate affixed pivot on the angle plate so that the block rotated around that and then use your angle box to set the required angles.

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
Meridienne oct 2019
ChesterUK
Eccentric July 5 2018
Ausee.com.au
TRANSWAVE Converters
Warco
cowbells
Eccentric Engineering
Allendale Electronics
emcomachinetools
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest